A129613 a(n) is the smallest natural number m such that 2^(2^k) + m is prime for k=0,1,...,n.

1, 1, 1, 1, 1, 15, 66747, 475425, 12124167, 14899339905, 8073774344085

Offset: 0

Author

Farideh Firoozbakht, May 13 2007, May 16 2007

Keywords

• nonn

Comments

The first five terms of this sequence correspond to known Fermat primes.

Crossrefs

Cf. A090872, A090874, A090875, A129614, A129615.

Extensions

a(10) from Jens Kruse Andersen, Jun 05 2010