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 A321157 #27 Dec 01 2018 09:10:36 %S A321157 11935,12376,21736,24220,41041,45441,51360,52326,53361,54145,54405, %T A321157 58311,58696,73360,82720,89425,90321,96580,101025,102025,108801, %U A321157 113050,117216,118405,122265,122500,122760,123201,123256,127281,128961,135201,144585,152076,165376,166635,169456,174097 %N A321157 Numbers that have exactly 7 representations as a k-gonal number, P(n,k) = n*((k-2)*n - (k-4))/2, k and n >= 3. %H A321157 Hugh Erling, <a href="/A321157/a321157.txt">Python program</a> %e A321157 11935 has representations P(n,k) = P(5, 1195) = P(7, 570) = P(10, 267) = P(14, 133) = P(35, 22) = P(55, 10) = P(154, 3). %e A321157 12376 has representations P(n,k) = P(4, 2064) = P(7, 591) = P(16, 105) = P(26, 40) = P(34, 24) = P(56, 10) = P(91, 5). %e A321157 21736 has representations P(n,k) = P(4, 3624) = P(8, 778) = P(11, 397) = P(16, 183) = P(19, 129) = P(22, 96) = P(208, 3). %Y A321157 Cf. A275256, A057145, A063778, A129654, A139601, A177029, A195527, A195528, A321156, A321158, A321159, A321160, A320943. %K A321157 nonn %O A321157 1,1 %A A321157 _Hugh Erling_, Oct 29 2018