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 A298701 #18 Jan 30 2018 21:05:04 %S A298701 3,11,17,5,13,17,7,13,19,5,17,29,7,13,31,7,23,41,7,19,67,5,29,73,7,31, %T A298701 73,13,37,61,7,11,13,41,13,37,97,7,73,103,3,5,47,89,7,13,19,37,11,13, %U A298701 17,31,7,11,13,101,13,37,241,7,13,19,73,17,41,233,7,13,31,61 %N A298701 Irregular triangle read by rows in which row n lists the prime factors of the n-th Carmichael number. %C A298701 The n-th row is the A002997(n)-th row of A027746. %C A298701 Length of the n-th row is A135717(n). %C A298701 First term of the n-th row is A141710(n). %C A298701 Last term of the n-th row is A081702(n). %H A298701 Tim Johannes Ohrtmann, <a href="/A298701/b298701.txt">Table of n, a(n) for n = 1..38296</a> (rows 1..8032, flattened) %e A298701 Array begins: %e A298701 3, 11, 17, %e A298701 5, 13, 17, %e A298701 7, 13, 19, %e A298701 5, 17, 29, %e A298701 7, 13, 31. %Y A298701 Cf. A002997, A027746, A081702, A135717, A141710. %K A298701 nonn,tabf %O A298701 1,1 %A A298701 _Tim Johannes Ohrtmann_, Jan 26 2018