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 A195188 #13 Feb 16 2025 08:33:15 %S A195188 1,1,5,45,488,7770,134461,2913994,67769386,1862487633,63473407780, %T A195188 2266783873440,95508217654131,4406526837238776,210850931948426737, %U A195188 10938149689908832133,635914633137982893475,40923887389117331715131,2705755577277227205802881 %N A195188 Number of decimal digits in n-th ultraprimorial. %H A195188 Eric W. Weisstein, <a href="https://mathworld.wolfram.com/Ultraprimorial.html">MathWorld: Ultraprimorial</a> %Y A195188 Cf. A165812. %K A195188 base,nonn %O A195188 0,3 %A A195188 _Kausthub Gudipati_, Sep 11 2011 %E A195188 More terms from _D. S. McNeil_, Sep 11 2011