A119386 Numbers k such that 2^(2*k)-(2*k-1) is prime.

0, 1, 2, 3, 8, 9, 27, 29, 50, 60, 252, 651, 1617, 7374, 8051, 11391, 17328, 32382, 35433

Offset

1,3

Comments

a(18) > 30000, if it exists. - Amiram Eldar, Dec 01 2021

Links

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

Mathematica

Select[Range[0, 2000], PrimeQ[2^(2#)-(2#-1)]&] (* Harvey P. Dale, May 20 2012 *)

Prog

(PARI) for(x=0, 1000, if(isprime(2^(2*x)-(2*x-1)), print1(x, ", ")))

Crossrefs

Cf. A100102.

Sequence in context: A085453 A271394 A030439 * A162219 A140484 A087034

Adjacent sequences: A119383 A119384 A119385 * A119387 A119388 A119389

Keyword

nonn,more

Author

Jorge Coveiro, Jul 25 2006

Extensions

a(14)-a(17) from Amiram Eldar, Dec 01 2021

a(18)-a(19) from Michael S. Branicky, May 15 2023

Status

approved