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 A064151 #27 Apr 18 2018 19:58:12 %S A064151 0,2,9,54,445,4821,65685,1077871,20700806,455052511,11262113374, %T A064151 309787170203,9373678643933,309378125685426,11059576578724264, %U A064151 425656284035217743,17547676024364306476,771403526860478324343,36020106660104388871845 %N A064151 Number of primes < n^n. %H A064151 Tomás Oliveira e Silva, <a href="http://sweet.ua.pt/tos/primes.html">Tables of values of pi(x) and of pi2(x)</a> [_Donovan Johnson_, Oct 14 2010] %H A064151 <a href="/index/Pri#primepop">Index entries for sequences related to numbers of primes in various ranges</a> %F A064151 a(n) = A000720(A000312(n)). - _Michel Marcus_, Aug 29 2014 %o A064151 (PARI) a(n) = primepi(n^n); \\ _Michel Marcus_, Apr 18 2018 %Y A064151 Cf. A000720, A000312. %K A064151 more,nonn %O A064151 1,2 %A A064151 _Jason Earls_, Sep 13 2001 %E A064151 a(13)-a(15) from _Donovan Johnson_, Oct 14 2010 %E A064151 a(16) from _Jens Kruse Andersen_, Jul 29 2014 %E A064151 a(17)-a(18) from _Henri Lifchitz_, Aug 29 2014 %E A064151 a(19) from _Chai Wah Wu_, Apr 18 2018