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 A216925 #16 Aug 05 2013 01:22:52 %S A216925 399,935,2015,2915,4991,5719,7055,12719,20705,20999,22847,46079,60059, %T A216925 63503,67199,76751,80189,88559,90287,104663,120581,152279,155819, %U A216925 196559,214199,230159,388079,482143,663679,676799,709019,741311,761039,776567,880319,966239 %N A216925 Lucas-Carmichael numbers with 3 prime factors. %H A216925 Donovan Johnson, <a href="/A216925/b216925.txt">Table of n, a(n) for n = 1..1000</a> %e A216925 a(1) = 399 = 3*7*19 %Y A216925 Cf. A006972 (Lucas-Carmichael numbers), A216926, A216927, A217002, A217003, A217091. %K A216925 nonn %O A216925 1,1 %A A216925 _Tim Johannes Ohrtmann_, Sep 20 2012