A100911 Numbers k such that (3*2^k - 1)^2 - 2 is prime.

0, 1, 4, 6, 15, 21, 25, 70, 129, 399, 511, 856, 9574, 14479, 17649, 27054, 28296, 32796, 38176

Offset

1,3

Comments

Next term > 100000.

a(1)-a(12) have been proved with PARI's ECPP; all subsequent terms correspond to BPSW PRPs. - Lucas A. Brown, Mar 28 2021

Links

Table of n, a(n) for n=1..19.

Lucas A. Brown, A100911.py

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: A266883 A034764 A119034 * A346297 A034765 A300276

Adjacent sequences: A100908 A100909 A100910 * A100912 A100913 A100914

Keyword

nonn,more

Author

Ray Chandler, Nov 21 2004

Extensions

a(1), a(14)-a(19) by Lucas A. Brown, Mar 28 2021

Status

approved