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 A301870 #7 Mar 28 2018 15:22:20 %S A301870 13,1021,12497,3294169,1365711509456878229586586894333 %N A301870 Primes of form 4*k^k - 3. %C A301870 The next term is too large to include. %F A301870 a(n) = 4*A301521(n)^A301521(n) - 3. %Y A301870 Cf. A301521, A301641, A301808. %K A301870 nonn %O A301870 1,1 %A A301870 _Seiichi Manyama_, Mar 28 2018