Friday, February 13, 2009

2101

2101 = 11 x 191.




2101 is a number n such that n, n + 1, and n + 2 are each the product of two primes: 2101 = 11 x 191, 2102 = 2 x 1051, 2103 = 3 x 701.

2101 is a number that yields a prime whenever a 1 is inserted anywhere in them, including the beginning or the end: 12101, 21101, and 21011 are all primes.


2101 Adonis was one of the first near-Earth asteroids to be discovered.

Source:
On-Line Encyclopedia of Integer Sequences
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