This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A050529 #12 May 05 2025 03:01:01 %S A050529 23,89,353,1409,5767169,23068673,96757023244289, %T A050529 26596368031521841843535873,467888254516290387262140085218681290753, %U A050529 1871553018065161549048560340874725163009,9050275065266633231852330504065427777405047260984689248417349633 %N A050529 Primes of the form 11*2^k + 1. %F A050529 a(n) = A083683(A002261(n)). - _Elmo R. Oliveira_, May 04 2025 %t A050529 Select[11*2^Range[210]+1,PrimeQ] (* _Harvey P. Dale_, Jun 15 2017 *) %Y A050529 For more terms see A002261. %Y A050529 Cf. A083683. %K A050529 nonn %O A050529 1,1 %A A050529 _N. J. A. Sloane_, Dec 29 1999