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 A247678 #22 Aug 21 2024 13:39:35
%S A247678 49,85,121,175,247,265,301,319,355,391,427,445,481,517,535,553,589,
%T A247678 625,679,697,715,805,841,895,913,931,949,985,1003,1057,1075,1111,1147,
%U A247678 1165,1183,1219,1255,1273,1309,1345,1363,1417,1435,1507,1525,1561,1615,1633
%N A247678 Odd composite numbers congruent to 4 modulo 9.
%H A247678 Odimar Fabeny, <a href="/A247678/b247678.txt">Table of n, a(n) for n = 1..10000</a>
%t A247678 Select[18Range[125] + 13, Not[PrimeQ[#]] &] (* _Alonso del Arte_, Sep 24 2014 *)
%t A247678 Select[Range[13,1700,18],CompositeQ] (* _Harvey P. Dale_, Aug 21 2024 *)
%o A247678 (PARI) lista(nn) = {forcomposite(n=1, nn, if ((n % 2) && ((n % 9) == 4), print1(n, ", ")); ); } \\ _Michel Marcus_, Sep 22 2014
%Y A247678 Cf. A017209 (9n + 4, supersequence of this sequence), A247676, A247679, A247681, A247682, A247683.
%K A247678 nonn,easy
%O A247678 1,1
%A A247678 _Odimar Fabeny_, Sep 22 2014