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 A050669 #6 Oct 14 2019 23:54:31 %S A050669 11,17,19,43,73,151,179,211,227,233,239,241,251,271,277,281,313,353, %T A050669 373,457,467,479,509,547,607,631,691,809,821,839,859,863,877,911,937, %U A050669 941,991,1097,1129,1171,1181,1201,1249,1367,1381,1427,1447,1579,1597 %N A050669 Primes p such that number of primes produced according to rules stipulated in Honaker's A048853 is 7. %e A050669 Altering a(1)=11 gives 7 primes: 31, 41, 61, 71, 13, 17 and 19. %Y A050669 Cf. A048853, A050673, A050658. %K A050669 nonn,base %O A050669 1,1 %A A050669 _Patrick De Geest_, Jul 15 1999