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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, 14666, 15680, 26712, 45840, 46019, 56220
OFFSET
1,2
LINKS
PROG
(PARI) for(n=1, 10^6, if(isprime((2^n+3)^2-8), print1(n, ", "))); /* Joerg Arndt, Apr 25 2011 */
CROSSREFS
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(36) from Charles R Greathouse IV, Oct 10 2011
a(37)-a(39) from Charles R Greathouse IV, Oct 11 2011
a(34)-a(35) inserted by Michael S. Branicky, Jul 25 2024
STATUS
approved