A129613 - OEIS

A129613

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

%I #7 Mar 31 2012 10:26:44

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

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

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

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

%K nonn

%O 0,6

%A _Farideh Firoozbakht_, May 13 2007, May 16 2007

%E a(10) from _Jens Kruse Andersen_, Jun 05 2010