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 A369248 #8 Jan 22 2024 21:58:00 %S A369248 3,15,63,99,159,171,207,219,243,279,303,339,387,399,531,579,603,639, %T A369248 675,699,747,783,819,879,891,963,1059,1107,1143,1179,1215,1227,1299, %U A369248 1323,1359,1467,1527,1563,1611,1659,1731,1779,1791,1803,1899,1923,1971,1983,2007,2019,2115,2235,2319,2403,2427,2487,2499,2547 %N A369248 Numbers of the form 12*m+3 for which there is no representation as a sum (p*q + p*r + q*r) with three odd primes p <= q <= r. %H A369248 Antti Karttunen, <a href="/A369248/b369248.txt">Table of n, a(n) for n = 1..10516</a> %o A369248 (PARI) isA369248(n) = ((3==(n%12)) && !A369054(n)); \\ Needs also code from A369054. %Y A369248 Intersection of A017557 and A369056, multiples of 3 in the latter. %Y A369248 Cf. A369054, A369055. %K A369248 nonn %O A369248 1,1 %A A369248 _Antti Karttunen_, Jan 22 2024