Wednesday, March 4, 2009

2641

2641 = 19 x 139.

2641 is a number n such that n, n + 1, and n + 2 are products of two primes: n + 1 = 2642 = 2 x 1321 and n + 2 = 2643 = 3 x 881.

2641 is a pseudosquare modulo 11. It is the first pseudosquare that is not prime.

2641 is a centered pentagonal number.


A Room with a View by E.M Forester is Project Gutenberg's book 2641.

Source:
Prime Curios!
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