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 A302333 #30 Feb 16 2025 08:33:53 %S A302333 3,11,43,2731,43691,174763,715827883,768614336404564651, %T A302333 56713727820156410577229101238628035243 %N A302333 Wagstaff primes related to The New Mersenne Conjecture that are the indices of perfect numbers in a list of centered 9-gonal numbers. %C A302333 Let p be a Wagstaff prime related to The New Mersenne Conjecture. Then (3p-2)(3p-1)/2 gives the perfect number whose index it is. %H A302333 Caldwell and Honaker, <a href="https://primes.utm.edu/curios/page.php?number_id=16956">56713...35243 (38-digits)</a>, Prime Curios! %H A302333 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/NewMersennePrimeConjecture.html">New Mersenne Prime Conjecture</a> %e A302333 For p = 3, (3*3-2)*(3*3-1)/2 = 28 and for p = 11, (3*11-2)(3*11-1)/2 = 496. %Y A302333 Cf. A000979, A107360. %K A302333 nonn,more %O A302333 1,1 %A A302333 _Steve Homewood_, Apr 05 2018