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 A000882 #18 Jan 26 2022 06:23:06 %S A000882 0,1,4,15,69,468,4636,57453,896062,18463713,425177757,11997649372, %T A000882 385088898632,13280323588034,509456736126003 %N A000882 Number of twin prime pairs <= product of first n primes. %H A000882 Tomás Oliveira e Silva, <a href="http://sweet.ua.pt/tos/primes.html">Tables of values of pi(x) and of pi2(x)</a> [From _Donovan Johnson_, Mar 01 2010] %Y A000882 Cf. A002110, A000849. %K A000882 nonn,more,hard %O A000882 1,3 %A A000882 gandalf(AT)hrn.office.ssi.net (James D. Ausfahl) %E A000882 More terms from _David W. Wilson_ %E A000882 a(10)-a(15) from _Donovan Johnson_, Mar 01 2010