2129

This number is a prime.

Single Curio View: (Seek other curios for this number)

The smallest Sophie Germain prime that is also a strong prime with digits that alternate in parity.

2129 is the smallest Sophie Germain prime that is also a twin prime with digits that alternate in parity.

2129, when concatenated with the next 2 primes, is prime: 212921312137 is prime. [Noll]

Submitted: 2009-08-09 18:27:32; Last Modified: 2016-03-01 11:38:10.