

A188936


Numbers k such that (2^k + 3)^2  8 is prime.


2



1, 2, 3, 4, 5, 6, 8, 10, 11, 12, 19, 27, 28, 32, 36, 48, 56, 61, 131, 170, 251, 750, 771, 779, 790, 874, 1176, 1728, 2604, 3541, 5394, 6203, 9230, 26712, 45840, 46019, 56220
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OFFSET

1,2


LINKS

Table of n, a(n) for n=1..37.
Daniel Shanks, Gauss's ternary form reduction and the 2Sylow subgroup, Math. Comp. 25 (1971), 837853.


PROG

(PARI) for(n=1, 10^6, if(isprime((2^n+3)^28), print1(n, ", "))); /* Joerg Arndt, Apr 25 2011 */


CROSSREFS

Cf. A188129, A188661, A188937.
Sequence in context: A087721 A226244 A140642 * A260317 A072666 A075471
Adjacent sequences: A188933 A188934 A188935 * A188937 A188938 A188939


KEYWORD

nonn,more


AUTHOR

N. J. A. Sloane, Apr 14 2011


EXTENSIONS

a(22)a(30) from Joerg Arndt, Apr 25 2011
a(31)a(33) from Vincenzo Librandi, May 13 2011
a(34) from Charles R Greathouse IV, Oct 10 2011
a(35)a(37) from Charles R Greathouse IV, Oct 11 2011


STATUS

approved



