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 A050658 #7 Oct 14 2019 23:56:52 %S A050658 11,17,19,21,27,39,43,51,57,69,73,81,87,93,151,179,189,203,207,211, %T A050658 227,233,239,241,249,251,271,277,281,299,301,303,313,323,329,351,353, %U A050658 371,373,381,391,403,413,423,457,467,479,509,511,513,519,531,533,537,547 %N A050658 Numbers n such that number of primes produced according to rules stipulated in Honaker's A048853 is 7. %e A050658 Altering a(4)=21 gives 7 primes: 11, 31, 41, 61, 71, 23 and 29. %Y A050658 Cf. A048853, A050662, A050669. %K A050658 nonn,base %O A050658 1,1 %A A050658 _Patrick De Geest_, Jul 15 1999