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%I #25 Nov 01 2022 12:22:24
%S 257,769,3329,7681,7937,9473,10753,11777,12289,13313,14081,14593,
%T 15361,17921,18433,19457,22273,23041,23297,25601,26113,26881,30977,
%U 31489,32257,36097,36353,37633,37889,39937,40193,40961,41729,43777,45569,46337,49409,49921
%N Primes of the form 256*k + 1.
%C Odd primes p such that -1 is a 128th power mod p. - _Eric M. Schmidt_, Mar 27 2014
%H Reinhard Zumkeller, <a href="/A208178/b208178.txt">Table of n, a(n) for n = 1..10000</a>
%F a(n) ~ 128n log n. - _Charles R Greathouse IV_, Nov 01 2022
%t Select[256 Range[195] + 1, PrimeQ]
%o (PARI) for(n=1,195,r=256*n+1; if(isprime(r), print1(r", ")));
%o (Magma) [ p: p in PrimesUpTo(50000) | p mod 256 eq 1 ];
%o (Haskell)
%o a208178 n = a208178_list !! (n-1)
%o a208178_list = filter ((== 1) . a010051) [1,257..]
%o -- _Reinhard Zumkeller_, Mar 06 2012
%Y Cf. A065091, A002144, A007519, A094407, A133870, A142925, A208177, A076339.
%K nonn,easy
%O 1,1
%A _Bruno Berselli_, Feb 25 2012
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