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 A122421 #12 Jul 17 2025 08:19:30 %S A122421 1451, %T A122421 145136923488338105028396848589202744949303228364801586309300455766242559575451783565953135771108682884704075157097064920307143357020423478488319 %N A122421 Soldner primes: primes formed from concatenation of decimal digits of Soldner's constant. %H A122421 Amiram Eldar, <a href="/A122421/b122421.txt">Table of n, a(n) for n = 1..4</a> %H A122421 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/ConstantPrimes.html">Constant Primes</a>. %H A122421 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/IntegerSequencePrimes.html">Integer Sequence Primes</a>. %Y A122421 Cf. A070769, A122422. %K A122421 nonn,base %O A122421 1,1 %A A122421 _Eric W. Weisstein_, Sep 03 2006