A100912 Numbers k such that (3*2^k+1)^2-2 is prime.

1, 2, 4, 10, 13, 19, 20, 34, 37, 40, 317, 1258, 1651, 3370, 3640, 3715, 6818, 6925, 8050, 18193

Offset

1,2

Comments

Next term is > 21000. - Ryan Propper, Sep 03 2005

Links

Table of n, a(n) for n=1..20.

S. Harvey, Carol and Kynea Primes.

Prog

(PARI) is(n)=ispseudoprime((3*2^n+1)^2-2) \\ Charles R Greathouse IV, Feb 19 2016

Crossrefs

Sequence in context: A216814 A180427 A127591 * A174721 A026224 A034233

Adjacent sequences: A100909 A100910 A100911 * A100913 A100914 A100915

Keyword

nonn

Author

Ray Chandler, Nov 21 2004

Extensions

One more term from Ryan Propper, Sep 03 2005

Status

approved