19

This number is a prime.

Just showing those entries submitted by 'Homewood': (Click here to show all)

10*n^2 + 19 produces 19 consecutive primes for n = 0 to 18. The digits of the 19th add up to 19. [Homewood]

There are 19 ways to total 19 using 19 letters, e.g., ONE PLUS EIGHT PLUS TEN. [Homewood]

If A = 1, B = 4, C = 1, … , Z = 8, using the decimal digits of π, then 'SEXY' and 'PRIME' are both sexy primes. [Homewood]

Cats have 19 pairs of chromosomes. [Homewood]

The longest known palindromic word is saippuakivikauppias (19 letters), which is Finnish for a dealer in lye (caustic soda). [Homewood]