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 A264011 #31 Jul 23 2025 15:39:06 %S A264011 2,3,4,5,8,16,27,28,33,36,48,66,90,112,508,1036,1041,1560,2208,2668, %T A264011 4388,6097,6517,11353,17284,22385,24740,29805,77188,135219,199237 %N A264011 Exponents n such that 2^(2*n+1) - 3*2^n - 1 (A195461) is prime. %C A264011 Obtained using a Lucas-Lehmer-type test due to Williams. %C A264011 Next term > 200000. %H A264011 H. C. Williams, <a href="http://projecteuclid.org/euclid.pjm/1102734270">A class of primality tests for trinomials which includes the Lucas-Lehmer test</a>, Pacific J. Math. Volume 98, Number 2 (1982), 477-494. %o A264011 (PARI) for(n=1,10^9,if(ispseudoprime(2^(2*n+1) - 3*2^n - 1),print1(n,", "))); \\ _Joerg Arndt_, Apr 08 2016 %Y A264011 Cf. A195461. %K A264011 nonn,more %O A264011 1,1 %A A264011 _Fabrice Lavier_, Jan 03 2016