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%I #14 Aug 27 2022 18:25:36
%S 1,1,1,1,1,1806390369,218327374070,3697211121741701604
%N a(n) is the smallest number m such that m^2^k + (m+1)^2^k is prime for k=0..n.
%C The first five terms of this sequence correspond to Fermat primes.
%e a(5)=1806390369 because this is the smallest number m such that m^2^k + (m+1)^2^k is prime for k=0,1,2,3,4 and 5.
%Y Cf. A090872, A090873, A019434, A000215.
%K nonn,hard,more
%O 0,6
%A _Farideh Firoozbakht_, Feb 06 2004
%E a(6) found by Kellen Shenton added by _Jeppe Stig Nielsen_, Mar 28 2022
%E a(7) from _Kellen Shenton_, Aug 27 2022
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