11

This number is a prime.

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Sir Frederick Pollock conjectured that every natural number is the sum of at most 11 centered nonagonal numbers. This is almost certainly true, but has not yet been proven. [Homewood]

There are 11 two-digit left-truncatable primes. [Homewood]

There are 11 prime quintuplets of the form {p, p + 4, p + 6, p + 10, p + 12} less than 10^5. [Homewood]

The New England Patriots have made 11 appearances in the Superbowl. [Homewood]

On a 12-hour clock the hour hand and minute hand overlap at 11 different times during the day. [Homewood]

The sum of any ten consecutive Fibonacci numbers is divisible by 11. [Homewood]

A day on Saturn is 11 about hours long. [Homewood]

'PRIME CURIOS!' contains 11 letters (and an exclamation mark). [Homewood]

'NINE PLUS TWO = FIVE PLUS SIX' has 11 letters on each side of the equals sign. [Homewood]

There are 11 Lucas primes less than ten thousand. [Homewood]

11 divides the sum of any 11-1 consecutive Lucas numbers. [Homewood]

The Canadian one dollar coin has 11 sides. There are also 11 points on the maple leaf on the Canadian flag. On Canadian banknotes, those with clocks on them, all show the time 11:00! [Homewood]

The number of time zones in Russia. [Homewood]

ELF is German for 11. Merry Christmas! [Homewood]