### Number of the Month (September 2017)

This week’s number is **56**.

**56** is the sum of the first six **triangular** numbers.

1 + 3 + 6 + 10 + 15 + 21

**56** is the sum of the six **prime** numbers.

3 + 5 + 7 + 11 + 13 + 17

The factors of **56** are 1, 2, 4, 7, 8, 14, 28 and **56**.

**56** in Roman numerals is expressed as LVI.

**56** is 111 000 in binary.

**56** spectators died in the **Bradford City** football stadium fire on 11 May 1985.

**56** is the atomic number of **Barium**.

**56** is the international dialling code of Chile.

**Shirley Temple** (US child actress) had **56** curls in her hair.

**56** men signed the US** Declaration of Independence** in 1776.

**Steve Jobs** died aged **56**.

### Number of the Month (July 2017)

This month's number is **54**.

**54** is a Leyland number. **54** can be written as the sum of three squares in three different ways:

7^{2} + 2^{2} + 1^{2} = 6^{2} + 3^{2} + 3^{2} = 5^{2} + 5^{2} + 2^{2} = **54**.

It is the smallest number with this property.

The factors of **54** are 1, 2, 3, 6, 9, 18, 27 and **54**.

There are **54** countries in Africa.

**54** in Roman numerals is expressed as LIV.

**54** is 110110 in binary.

**54** is the atomic number of **Xenon**.

A score of **54** in golf is colloquially referred to as a perfect round.

This score has never been achieved in competition.

**54** is the international dialling code of Argentina.

### Number of the Month (June 2017)

This week’s number is **38**.

**38** is the sum of the squares of the first three primes.

**38** is the largest even number that cannot be written as the sum of two odd composite numbers.

The factors of **38** are 1, 2, 19 and **38**

**38** in Roman numerals is expressed as XXXVIII

**38** is 100110 in binary.

**38** is the atomic number of **Strontium**.

**38** is the number of games of football played by each team, each season in the EPL (English Premier League) and La Liga (Spain).

**38** is the number of slots on an American roulette wheel. (1 to 36, 0, 00)

### Number of the Month (April 2017)

This week’s number is **45**.

**45** is a triangular number, and in particular the sum of all the decimal digits

(0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = **45**)

The factors of **45** are 1, 3, 5, 9, 15 and **45**

**45** in Roman numerals is expressed as XLV

**45** is 101101 in binary.

**45** is the atomic number of **Rhodium**.

There are **45** degrees in half of a right angle.

+**45** is the telephone dialing code for Denmark.

A football game consists of two halves of **45** minutes each.

World War Two ended in 19**45**.

### Number of the Week (20 March 2017)

This week’s number is **59**.

**59** is the 17th prime number.

The factors of **59** are 1 and **59**

**59** in Roman numerals is expressed as LIX

**59** is 111011 in binary.

**59** is the atomic number of **Praseodymium**.

A **59** sided polygon is called a nonogon

Beethoven’s Opus**59** consists of the three so-called Razumovsky Quartets

The 1960s song **“59 ^{th}" Street Bridge Song (Feelin’ Groovy)”** was a big hit for

**Simon and Garfunkel**

**59** is apporoximately the number of days in 2 lunar months.

In the USA the Interstate **59** runs between Minnesota and Texas.

**59** is the lowest recorded golf score on the womens’ LPGA tour by **Annika Sorenstam**.

### Number of the Week (13 March 2017)

This week’s number is **9**.

**9** is a composite number.

The factors of **9** are 1, 3 and **9**

**9** is a perfect square (32).

**9** in Roman numerals is expressed as IX

**9** is 1001 in binary.

**9** is the atomic number of Flourine.

A **9** sided polygon is called a nonogon

### Number of the Week (27 February 2017)

This week’s number is **27**.

The factors of **27** are 1, 3, 9, and **27**

**27** is a perfect cube (33).

**27** in Roman numerals is expressed as XXVII.

**27** is 11011 in binary.

**27** is the atomic number of Cobalt.

**27** is the only positive integer that is three times the sum of its digits.

Dark matter is thought to make up **27**% of the universe.

**27** is the number of letters in the Spanish alphabet.

### Number of the Week (21 November 2016)

This week’s number is **30**.

The factors of **30** are 1, 2, 3, 5, 6, 10, 15 and **30**

**30** is the number of tracks on the Beatles’ famous **The White Album**.

**30** in Roman numerals is expressed as XXX.

**30** is 11110 in binary.

**30** is the atomic number of Zinc

The Platonic solids, the **dodecahedron** and the **icosahedron** both have **30** faces

**30** years of marriage is called the **pearl** anniversary.

### Number of the Week (7 November 2016)

This week’s number is **41**.

The factors of **41** are 1 and **41**

**41** is the 13^{th} smallest prime number.

**41** is the sum of the first six prime numbers.

**41** is the sum of two squares 16 and 25.

**41** in Roman numerals is expressed as XL1.

**41** is 101001 in binary.

**41** is the atomic number of Niobium

Symphony **41** is the longest and last symphony of Wolfgang Amadeus Mozart.

**41** was The race number worn by Sir Roger Bannister when he broke the mythical 4-minute mile barrier in 1954.

George H W Bush was the **41**^{st} President of the United States

### Number of the Week (31 October 2016)

This week’s number is **111**.

The factors of **111** are 1, 3, 37 and **111**

**111** in Roman numerals is expressed as CX1.

**111** is 1101111 in binary.

**111** is the atomic number of Roentgenium (rg).

The emergency telephone number in New Zealand is **111**.

A score of **111** in cricket or multiples thereof (222 = "double nelson", 333 = "triple nelson" and so on) is considered unlucky by some in English cricket: most famously by the international umpire David Shepherd who had a whole retinue of peculiar mannerisms - hops, shuffles, jiggles and so on - that he would indulge in if the score was ever a "Nelson" multiple.

Particularly if the number of wickets also matched - **111**/1, 222/2 etc.

Occasionally **111** is referred to as "eleventy- one", as read in The Fellowship of the Ring by J.R.R. Tolkien

**111** is the lowest positive integer requiring six syllables to name in American English, or seven syllables (including "and") in Canadian and British English.

### Number of the Week (25 October 2016)

This week’s number is **75**.

The factors of **75** are 1, 3, 5, 15, 25 and **75**.

52 in Roman numerals is expressed as LXXV.

52 is 1001011 in binary.

52 is the atomic number of **rhenium**.

The age limit for Canadian senators is **75**.

### Number of the Week (17 October 2016)

This week’s number is **52**.

The factors of **52** are 1, 2, 4, 13, 26 and **52**.

**52** in Roman numerals is expressed as LII.

**52** is 110100 in binary.

**52** is the atomic number of **tellurium**.

A year has approximately **52** weeks.

On a piano there are **52** white keys.

**52** is the international direct dial code for Mexico.

There are **52** cards in a standard pack of playing cards.

### Number of the Week (12 September 2016)

This week’s number is **29**

**29** is the tenth prime number

The factors of **29** are 1 and **29**.

**29** in Roman numerals is expressed as XXIX.

**29** is 11101 in binary.

**29** is the atomic number of **copper**.

None of the first **29** natural numbers have more than two different prime factors.

This is the longest such consecutive sequence.

India has **29** states.

**29** Palms is the name of a town in California, in the USA.

The Lunar month is close to **29** days.

### Number of the Week (29 August 2016)

This week’s number is **90**

The factors of **90** are 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45 and **90**.

**90** in Roman numerals is expressed as XC

**90** is 1011010 in binary.

**90** is the atomic number of **thorium**.

**90** is the direct dial number for Turkey.

**90** is the latitude in degrees of the North and South poles.

There are **90** minutes in a football match.

### Number of the Week (22 August 2016)

This week’s number is **92**.

The factors of **92** are 1 and **92**.

**92** is a **pentagonal** number

**92** in Roman numerals is expressed as XC11

**92** is 1011100 in binary.

**92** is the atomic number of **uranium**.

**92** is the direct dial number for Pakistan.

**92** letters in the longest place name in the world in New Zealand:

**Taumatawhakatangihangakoauauotamateaurehaeaturipukakapikimaungahoronukupok**

The **92** Club is a society of UK football fans who have attended a home match of all **92** current member clubs of the Premier League and The Football League in England and Wales.

### Number of the Week (27 June 2016)

This week’s number is **73**

The factors of **73** are 1 and **73**.

**73** is the 21^{st} prime number.

**73** in Roman numerals is expressed as LXXIII.

**73** is 1001001 in binary.

**73** is the atomic number of **tantalum**.

**73** is the number of seconds it took for the Space Shuttle Challenger shuttle to explode.

### Number of the Week (13 June 2016)

This week’s number is **16**.

The factors of **16** are 1, 2, 4, 8 and **16**.

**16** is the fourth power of 2.

**16** in Roman numerals is expressed as XVI.

**16** is 10000 in binary.

**16** is the atomic number of **sulphur**.

### Number of the Week (9 May 2016)

This week’s number is **44**

The factors of **44** are 1, 2, 4, 11, 22 and **44**

**44** is a composite number

**44** in Roman numerals is expressed as XLIV

**44** is 101100 in binary

**44** is the atomic number of **ruthenium**

**44** is a palindromic number and also a “happy” number.

**44** is the driver number of Lewis Hamilton , the Formula One racing car driver.

**44** is the direct dialing code for the United Kingdom.

Route **44** is the Interstate Highway in the US that runs from Texas to Missouri.

**44** fours is the name of a song by Jay Z where he rhymes the words four, for and fore **44** times.

Vicks Formula **44** is a popular cough medicine.

Barack Obama is the **44**th President of the United States.

### Number of the Week (11 April 2016)

This week’s number is **22**

The factors of **22** are 1, 2, 11 and **22**

**22** is a composite number

**22** in Roman numerals is expressed as XXII

**22** is 10110 in binary

**22** is the atomic number of **titanium**

**22****/7** is used as an approximation for the irrational number π

The **22** is an important line on a rugby field, **22** metres from each try-line

In Australian Rules football, each squad is allowed **22** players

**22** yards is the length of a cricket pitch

Taylor Swift has a song on her fourth album **Red** called **22**

Catch **22** is a famous novel by Joseph Heller

There are **22** **yards** in a **chain**

There are **22** players on the field at any one time in a soccer game and an American football game..

### Number of the Week (4 April 2016)

This week’s number is **51**

The factors of **51** are 1, 3, 17 and **51**

**51** is a composite number

**51** in Roman numerals is expressed as LI

**51** is 110011 in binary

**51** is the atomic number of **antimony**

**51** is the direct dial code for **Peru**

**51** is the title of a 2011 Horror movie

**51**^{st} State is the name given to any future state of the US

**51** is the name of an episode of the TV series **Breaking Bad**

### Number of the Week (21 March 2016)

This week’s number is **67**.

The factors of **67** are 1 and **67**.

**67** is the 19^{th} prime number.

**67** in Roman numerals is expressed as LXVII

**67** is 1000011 in binary.

**67** is the atomic number of **holmium**, a lanthanide.

Two songs are, “**Questions 67 and 68**” by the band Chicago and “**Old 67**” by Elton John

**67** is the highest two digit number presently NOT designating a highway in the US.

**67** is the number of throws in Judo

### Number of the Week (7 March 2016)

This week’s number is **79**.

The factors of **79** are 1 and **79**

**79** is the 22^{nd} prime number

**79** in Roman numerals is expressed as LXXIX

**79** is 1001111 in binary.

**79** is the atomic number of **gold (Au)**.

**79** is the record number of cumulative weeks at Number 1 on the music charts held by Elvis Presley

### Number of the Week (29 February 2016)

This week’s number is **85**.

The factors of **85** are 1, 5, 17 and **85**

The prime factors are 5 x 17

**85** in Roman numerals is expressed as LXXXV

**85** is 1010101 in binary.

**85** is the atomic weight of **astatine**

**85** is a **biprime**, the product of two prime numbers 5 and 17.

**85** along with 86 and 87 is the second cluster of consecutive biprimes.

In base 2, **85** is a palindrome (1010101)

**85** is a centred triangular number.

### Number of the Week (22 February 2016)

This week’s number is **63**.

The factors of **63** are 1, 3, ,7, 9, 21 and **63**

The prime factors are 3^{2} x 7

**63** in Roman numerals is expressed as LXIII

**63** is 111111 in binary.

**63** is the atomic weight of **europium**.

**63** is the smallest whole number that can be divided by any number from 1 to 9 without repeating decimals.

The Philippines has 0**63** as its international dialling code.

There are **63** chromosomes in a donkey **and** a horse.

### Number of the Week (8 February 2016)

This week’s number is **28**.

The factors of **28** are 1, 2, 4,7, 14 and **28**

**28** in Roman numerals is expressed as XXVIII

**28** is 11100 in binary.

**28** is the atomic weight of **silicon**.

There are **28** countries in the European Union (June 2015). **Croatia** being the latest.

No country has 0**28** as its international dialing code.

There are **28** dominoes in a standard set of dominoes.

**28** is the sum of the first 5 prime numbers.

**28** is the number of days in the shortest month of the year (except in Leap years).

**28** was the number of sports at the Sydney (2000) Olympics.

The normal number of human teeth (excluding wisdom) is **28**.

It takes **28** Earth years for Saturn to revolve around the Sun.

### Number of the Week (1 February 2016)

This week’s number is **70**.

The factors of **70** are 1, 2, 5, 7, 10, 14, 35 and **70**

**70** in Roman numerals is expressed as LXX

**70** is 1000110 in binary.

**70**^{2} is the sum of the first 24 square numbers starting at 1.

The Old Testament of the Bible allots three score and ten (**70** years) for a man's life.

In Olympic Archery, the targets are **70** metres from the archers.

**70** is the atomic number of **ytterbium**, a lanthanide.