### Number of the Week (14 December 2015)

This week’s number is **37**.

The factors of **37** are 1 and **37**

**37** in Roman numerals is expressed as XXXVII

**37** is 100101 in binary.

**37** is the 12^{th} **Prime** number

**37** and **38** are the first pair of consecutive positive integers that are not divisible by any of their digits.

**37** is the normal human body temperature in degrees Celsius.

William Shakespeare is thought to have written **37** plays (counting Henry IV as three parts).

In gambling, there are **37** numbers on a roulette wheel (0 – 36).

There are 10 international dialing codes that begin with the digits **37**.

**37** is the number people choose most often when asked to give a number between 1 and 100.

### Number of the Week (30 November 2015)

This week’s number is **11**.

The factors of **11** are 1 and 11.

**11** in Roman numerals is expressed as XI.

**11** is 10**11** in binary.

**11** is the 5^{th} **Prime** number.

An **11**-sided polygon is called a **hendecagon** or **undecagon**.

Apollo **11** was the first manned spacecraft to land on the Moon.

There are **11** players in soccer and field hockey teams.

In American football there are **11** players on the field at any on time.

If a number is divisible by **11**, reversing its digits will result in another multiple of **11**.

World War One ended on with an Armistice in November, 1918. It went into effect at **11**am on the **11**^{th} day of the **11**^{th} month.

The maple leaf on the flag of Canada has **11** points.

### Number of the Week (16 November 2015)

This week’s number is **53**.

The factors of **53** are 1 and **53**.

**53** in Roman numerals is expressed as LIII

**53** is 110101 in binary.

**53** is the 16^{th} **Prime** number.

**53** is the atomic number of iodine.

**53** is the international direct dial number for phone calls to Cuba.

**53** was the racing number of **Herbie**, the VW Beetle from the 1969 movie, **The Love Bug**.

**53** was the record number of field goals scored by **Michael Jordan**, in a three-game series in the NBA Basket ball play-offs, in 1992.

### Number of the Week (2 November 2015)

This week’s number is **99**.

The factors of **99** are 1, 3, 9, 11, 33, 99.

**99** in Roman numerals is expressed as XCIX

The prime factors of **99** are 3 x 3 x 11

**99** is 1100011 in binary.

**99** is the sum of the cubes of three consecutive whole numbers 2^{3} + 3^{3} + 4^{3}

**99** is a **palindromic** number.

**99** is the atomic number of Einsteinium. It was discovered in 1952 in the debris of the first H-bomb explosion and named after Albert Einstein.

The earliest known reference to a **99**-flake ice-cream with a chocolate flake was in 1935. One idea links it to a shop in Scotland at **99** Portobello High St which added chocolate flakes to its ice-creams.

“If you wish to live to the age of **99**, please walk. 100 steps after each meal,” (Chinese proverb).

### Number of the Week (19 October 2015)

This week’s number is **14**.

The factors of **14** are 1, 2, 7, **14**.

**14** in Roman numerals is expressed as XIV

The prime factors of **14** are 2 x 7

**14** is 1110 in binary.

**14** is the sum of the first three square numbers making it a **square pyramidal number**.

There are **14** pounds in a stone. (British weight measurements before metrics)

The atomic number of **Silicon** is **14**.

**14** is the number of days in a **fortnight**.

The Top **14** is the highest-level rugby competition in France.

**14** – the shirt number worn by Johan Cruyff, the Dutch footballer. No longer used by his former club Ajax.

There are **14** lines in a **sonnet**.

February **14** – St Valentine’s Day

### Number of the Week (21 September 2015)

This week’s number is **95**.

The factors of **95** are 1, 5, 19, **95**.

**95** in Roman numerals is expressed as XCV

The prime factors of **95** are 5 x 19

**95** is 1011111 in binary.

In statistics a **95** % confidence interval is considered satisfactory for most purposes.

**Hit** **95** **FM**- A popular Indian radio station.

The atomic number of **Americium** is **95**.

United States Interstate **95**, a freeway that runs from Florida to Maine.

Windows **95** A popular computer operating system.

**95** – a good mark and a good age!

### Number of the Week (14 September 2015)

This week’s number is **25**.

The factors of **25** are 1, 5, **25**.

**25** in Roman numerals is expressed as XXV

The prime factors of **25** are 5 x 5 or 5^{2}

**25** is 11001 in binary.

**25** is the smallest square that is also the sum of two non-zero squares (**25** = 3^{2} + 4^{2})

**25** is a square number 5^{2} = **25**

**25** years of marriage is marked by a **SILVER** wedding anniversary.

The atomic number of **Manganese** is **25**.

**The M** **25** is a motorway around London.

United States Interstate **25**, a freeway that runs from New Mexico to Wyoming.

### Number of the Week (7 September 2015)

This week’s number is **57**.

The factors of **57** are 1, 3, 19 and **57**.

**57** in Roman numerals is expressed as LVII.

The prime factors of **57** are 3 x 19.

**57** is 111001 in binary.

**57** is the number of varieties of foods claimed to be produced by the H.J. Heinz Company.

The code of international dialling calls to **Columbia** is **57**

The atomic number of **Lanthanum** is **57**.

**Interstate** **57** is a freeway in the USA that runs from Missouri to Chicago.

### Number of the Week (31 August 2015)

This week’s number is ** 26**.

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

**26** in Roman numerals is expressed as XXVI

The prime factors of **26** are 2 x 13.

**26** is 11010 in binary.

The atomic number of Iron is **26**.

A rhombicuboctahedron has **26** faces.

When 27 small cubes are made into a larger 3x3x3 cube, **26** of them can be seen on the outside of the larger cube.

There are **26** miles, rounded, in a marathon running race.

**26** is the "joke throw" in the game of darts, where a player throws 20, 5 and 1 when aiming for 20 (or treble 20). In professional darts, throwing **26** usually results in sneers or laughter from the audience.

**26** is the number of bones in the normal human **foot** and **ankle**.

**26** is the number of letters in the English alphabet.

There are **26** red cards and **26** black cards in a normal deck of cards.

**26** is the only number that is 1 more than a square number (**25** = 5^{2}) AND 1 less than a cube (**27** = 3^{3})

### Number of the Week (24 August 2015)

This week’s number is **19**.

**19** is the 8th prime number.

**19** in Roman numerals is expressed as XIX.

**19** is 10011 in binary.

**19** is a **centred** triangle number.

The atomic number of **Potassium** is **19**.

The game of GO, is usually played on a grid of **19** X **19**.

**19** (or 18) is often the minimum age for buying alcohol and tobacco in many places around the world.

### Number of the Week (17 August 2015)

This week’s number is **77**.

**77** is the sum of the first eight prime numbers.

i.e. 2 + 3 + 5 + 7 + 11 + 13 + 17 + 19

**77** is the sum of the squares of three consecutive whole numbers.

i.e. 4^{2} + 5^{2} + 6^{2}

The prime factors of **77** are 7 and 11.

**77** in Roman numerals is expressed as LXXVII.

**77** is 1001101 in binary.

**77** Sunset strip was a popular TV programme in the 1950’s-1960’s

The atomic number of **iridium** is **77**.

**77** is the boiling point of nitrogen (in degrees Kelvin), that is equal to –195.79^{o}C.

**77** is the only whole number under 100 which when spoken has 5 syllables.

### Number of the Week (10 August 2015)

This week’s number is **33**.

**33** is the smallest sum of two different positive numbers each of which raised to the fifth power: 1^{5} + 2^{5}

**33** is the largest positive integer that cannot be expressed as the sum of different triangle numbers.

The prime factors of **33** are 3 and 11.

In **Roman** Numerals the number **33** can be written as **XXXIII**.

**33** is **100001** in binary.

The atomic number of **arsenic** is **33**.

A normal human spine has **33** vertebrae when the bones that form the coccyx are counted individually.

In the Bible,** Jesus’s age** when he was crucified was **33** (Hence 33AD)

Islamic prayer beads are generally arranged in sets of **33**.

In reference to vinyl gramophone records, **33** represents a type of record (known as an LP or long-playing record) with a speed of **33** 1/3 revolutions per minute.

In the English Premier league, the former Chelsea goal-keeper Petr Cech selected the squad number **33** on signing for Arsenal FC in June 2015. He cited that it represented his age **33**, his 333 Premier League games and that he wanted to be the spine (with **33** vertebrae) of the team.

### Number of the Week (3 August 2015)

This week’s number is **8**.

**8** is a composite number. It is the first number that is neither prime nor semi-prime.

**8** is a power of 2 i.e. 2^{3}.

A number is divisible by **8** if the number formed by the last three digits are divisible by 8.

The number **8** is an **even** number.

The **factors** of **8** are 1, 2, 4 and 8 – so 8 is divisible by 4 numbers.

**8** is a **Fibonacci** number (3 + 5).

A **polygon** with **8** sides is called an **octagon**.

A **polyhedron** with **8** faces is called an **octahedron**. Each face is an equilateral triangle.

A **cube** has **8** vertices.

A **octahedron** has faces as 6 congruent squares and 8 congruent equilateral triangles.

In **Roman** Numerals the number **8** can be written as **VIII**.

**8** is the atomic number of **oxygen**.

All spiders have **8** legs.

A **byte** is **8 **bits.

There are **8 ****furlongs** in a mile.

### Number of the Week (20 July 2015)

This week’s number is **91**.

**91** is a triangle number.

**91** is the 27^{th} distinct **semiprime**.

The code of international direct dial phone calls to India is **91**.

The number **91** is an **odd **number.

The **factors** of **91** are 1, 7, 13, and 91 – so 91 is divisible by 4 numbers.

The only **prime factors** of **91** are 7 and 13.

**91**% as a fraction is 91/100 or 0.91 as a decimal.

In the binary number system **91** can be written as **1011011**.

In **Roman** Numerals the number **91** can be written as **XCI**.

If you travelled a distance of **91** miles then this would be equivalent to about 146 kilometers.

Also a length of **91** feet is equivalent to 28 meters.

A weight of **91** pounds is equivalent to 41.3 kilograms.

A temperature of **91** degree Celsius is about 196 degree Fahrenheit.

**91** is the atomic number of protactinium, an actinide.

### Number of the Week (29 June 2015)

This week’s number is **46**.

**46** is the number of **human chromosomes**.

**46** is the 16^{th} **semiprime**.

In geometry, the name of a **46** sided polygon is called a **tetracontakaihexagon**.

The number **46** is an **even** number - the 23rd **even** number to be precise.

The **factors** of **46** are 1, 2, 23 and 46 – so 46 is divisible by 4 numbers.

The only **prime factors** of **46** are 2 and 23

**46**% as a fraction is 23/50 or 0.46 as a decimal.

In the binary number system **46** can be written as **101110**.

In **Roman** Numerals the number **46** can be written as **XLVI**.

If you travelled a distance of **46** miles then this would be equivalent to 74 kilometers.

Also a length of **46** feet is equivalent to 14.0 meters.

A weight of **46** pounds is equivalent to 20.9 kilograms.

A temperature of **46** degree Celsius is about 115 degree Fahrenheit.

### Number of the Week (22 June 2015)

This week’s number is **89**.

**89** is the **24th Prime Number**.

**89** is a **Fibonacci number** and therefore a **Fibonacci Prime**.

**89** is the **10th Mersenne Prime**.

**89** is part of the **Pythagorean Triple **(39, 80, 89) because 39^{2} + 80^{2} = 89^{2}.

**89** is an atomic number of the element **actinium**.

### Number of the Week (15 June 2015)

This week’s number is **49**.

**49** is a **square** number. **49** = 7^{2}

**49** is the first square where the digits are squares (4 and 9).

**Arsenal Football Club**, in the English Premier League, had an unbeaten run of **49** games between May 2003 through to October 2004 when they lost to Manchester United. This remains a national record in English football.

**49** is the atomic number of the element **indium**.

The sum of the digits of the **square** of **49** (2401) is the **square root** of **49**.

**49** is **trimorphic**, that is, its **cube** ends in the same digits i.e. **49**^{3} = 1176**49**

### Number of the Week (8 June 2015)

This week’s number is **35**.

**35** is the sum of the first 5 triangle numbers. i.e. 1 + 3 + 6 + 10 + 15 = 35.

**35** is a tetrahedral number.

**35** is the number of ways 3 objects can be selected from 7 objects (a combination)

**35** is a semi-prime (a product of two prime numbers 5 x 7)

There are **35** hexominoes (polyominoes made from 6 squares)