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 A050525 #15 May 05 2025 03:01:07 %S A050525 43,738197503,12384898975268863,198158383604301823, %T A050525 935776509032580774524280170437362581503, %U A050525 239558786312340678278215723631964820865023,1243860333603982568026641440523014635142548663400435746517610765710004322303 %N A050525 Primes of the form 11*2^k - 1. %H A050525 <a href="/index/Pri#riesel">Index entries for sequences of n such that k*2^n-1 (or k*2^n+1) is prime</a>. %F A050525 a(n) = A086225(A001772(n)). - _Elmo R. Oliveira_, May 04 2025 %t A050525 Select[11 2^Range[0,250]-1,PrimeQ] (* _Harvey P. Dale_, Mar 30 2011 *) %Y A050525 See A001772 for more terms. %Y A050525 Cf. A086225. %K A050525 nonn,nice %O A050525 1,1 %A A050525 _N. J. A. Sloane_, Dec 29 1999