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 A165812 #10 Feb 16 2025 08:33:11 %S A165812 1,4,46656,205891132094649000000000000000000000000000000 %N A165812 Ultraprimorials: a(n) = p#^p#. %C A165812 The n-th Primorial raised to its own power. %C A165812 Terms from a(4) on have 488, 7770, 134461 and 2913994 digits (A195188) and are too large to be listed explicitly. %H A165812 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Ultraprimorial.html">Ultraprimorial</a> %F A165812 a(n) = A000312(A002110(n)) . [R. J. Mathar, Sep 29 2009] %p A165812 P:=proc(i) local a,n; a:=1; print(1); for n from 1 by 1 to i do a:=a*ithprime(n); print(a^a); od; end: P(10); %Y A165812 Cf. A002110, A046882 %K A165812 easy,nonn %O A165812 0,2 %A A165812 _Paolo P. Lava_ and _Giorgio Balzarotti_, Sep 28 2009 %E A165812 Slightly edited by _R. J. Mathar_, Sep 29 2009