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Square array: T(n,k) gives n-th number a such that a^(2^k)+1 is prime (a generalized Fermat).
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%I #14 Nov 11 2019 03:52:07

%S 1,2,1,4,2,1,6,4,2,1,10,6,4,2,1,12,10,6,4,2,1,16,14,16,118,44,30,1,18,

%T 16,20,132,74,54,102,1,22,20,24,140,76,96,162,120,1,28,24,28,152,94,

%U 112,274,190,278,1,30,26,34,208,156,114,300,234,614,46,1,36,36,46,240,158

%N Square array: T(n,k) gives n-th number a such that a^(2^k)+1 is prime (a generalized Fermat).

%D Harvey Dubner, J. Recr. Math., 18, 1986.

%H Yves Gallot, <a href="http://yves.gallot.pagesperso-orange.fr/primes/">Generalized Fermat Prime Search</a>.

%e {1}; {2,1}; {4,2,1}; ...

%e See the well-formed array on Gallot's page.

%Y Cf. A056993, A006093, A005574, A000068, A006314, A006313, A006315, A006316, A056994, A056995, A057465, A057002, A088361, A088362.

%K nonn,tabl

%O 0,2

%A _Jeppe Stig Nielsen_, Oct 01 2003