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 A111980 #7 Jul 09 2024 17:23:40 %S A111980 7,11,13,17,19,23,37,41,43,47,67,71,79,83,97,101,103,107,109,113,127, %T A111980 131,163,167,193,197,223,227,229,233,277,281,307,311,313,317,349,353, %U A111980 379,383,397,401,439,443,457,461,463,467,487,491,499,503,613,617,643 %N A111980 Union of pairs of consecutive primes p, q with q-p = 4. %t A111980 Flatten[Select[Partition[Prime[Range[200]],2,1],#[[2]]-#[[1]]==4&]]//Union (* _Harvey P. Dale_, Jul 09 2024 *) %Y A111980 Essentially the same as A094343. %Y A111980 Union of A029710 and A031505. %Y A111980 Cf. A140546. %K A111980 nonn %O A111980 1,1 %A A111980 _Ray Chandler_, Aug 24 2005