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 A038530 #10 Jun 27 2021 07:58:21 %S A038530 24,36,58,79,1110,1312,1714,1915,2316,2918,3120,3721,4122,4324,4725, %T A038530 5326,5927,6128,6730,7132,7333,7934,8335,8936,9738,10139,10340,10742, %U A038530 10944,11345,12746,13148,13749,13950,14951,15152,15754,16355,16756 %N A038530 Concatenate n-th prime and n-th composite. %Y A038530 For primes see A038531. %K A038530 nonn,base %O A038530 1,1 %A A038530 Vasiliy Danilov (danilovv(AT)usa.net), Jul 14 1998