A264011 Exponents n such that 2^(2*n+1) - 3*2^n - 1 (A195461) is prime

2, 3, 4, 5, 8, 16, 27, 28, 33, 36, 48, 66, 90, 112, 508, 1036, 1041, 1560, 2208, 2668, 4388, 6097, 6517, 11353, 17284, 22385, 24740, 29805, 77188, 135219, 199237

Offset

1,1

Comments

Obtained using a Lucas-Lehmer-type test due to Williams.

Next term > 200000.

Links

Table of n, a(n) for n=1..31.

H. C. Williams, A class of primality tests for trinomials which includes the Lucas-Lehmer test, Pacific J. Math. Volume 98, Number 2 (1982), 477-494.

Prog

(PARI) for(n=1, 10^9, if(ispseudoprime(2^(2*n+1) - 3*2^n - 1), print1(n, ", "))); \\ Joerg Arndt, Apr 08 2016

Crossrefs

Cf. A195461.

Sequence in context: A333264 A247461 A281303 * A337280 A081711 A055638

Adjacent sequences: A264008 A264009 A264010 * A264012 A264013 A264014

Keyword

nonn,more

Author

Fabrice Lavier, Jan 03 2016

Status

approved