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 A173672 #11 Jul 30 2021 08:43:23 %S A173672 1,2,3,5,8,11,12,16,17,18,20,24,27,28,29,30,32,36,40,41,42,44,45,48, %T A173672 50,52,54,56,59,60,64,66,68,70,71,72,76,78,80,81,84,88,90,92,96,98,99, %U A173672 100,101,102,104,105,107,108,110,112,114,116,120,124,125,126,128,130,132,135,136,137,138,140,144,147,148 %N A173672 Positive differences between any two primes without the differences that are semiprimes. %F A173672 A030173 \ A001358. [_R. J. Mathar_, Nov 25 2010] %Y A173672 Cf. A173656. %Y A173672 Cf. A030173, A001358. %K A173672 nonn %O A173672 1,2 %A A173672 _Juri-Stepan Gerasimov_, Nov 24 2010 %E A173672 Sequence corrected by _R. J. Mathar_, Nov 25 2010