A050529 Primes of the form 11*2^k + 1.

23, 89, 353, 1409, 5767169, 23068673, 96757023244289, 26596368031521841843535873, 467888254516290387262140085218681290753, 1871553018065161549048560340874725163009, 9050275065266633231852330504065427777405047260984689248417349633

Offset: 1

Author

N. J. A. Sloane, Dec 29 1999

Keywords

• nonn

Crossrefs

For more terms see A002261.

Cf. A083683.

Programs

Mathematica

Select[11*2^Range[210]+1,PrimeQ] (* Harvey P. Dale, Jun 15 2017 *)

Formula

a(n) = A083683(A002261(n)). - Elmo R. Oliveira, May 04 2025