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 A156329 #16 Feb 16 2025 08:33:09 %S A156329 4,10,84,1140,7140,125580,2929290,161226780,2875585020,32451432090, %T A156329 9117204216120,173092525291140,12728365882372140,6235727798083743960, %U A156329 843456728066008506450,68313970807402942762140,7219596660397839675355860,211677272048242059920400540 %N A156329 Smallest tetrahedral number with n distinct prime factors. %H A156329 Donovan Johnson, <a href="/A156329/b156329.txt">Table of n, a(n) for n = 1..22</a> %H A156329 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/TetrahedralNumber.html">Tetrahedral Numbers</a>. %e A156329 a(9) = 2875585020 = 2^2*3*5*7*11*17*19*41*47. 2875585020 is the smallest tetrahedral number with 9 distinct prime factors. %Y A156329 Cf. A000292. %K A156329 nonn %O A156329 1,1 %A A156329 _Donovan Johnson_, Feb 08 2009 %E A156329 Edited by _Donovan Johnson_, Nov 24 2010 %E A156329 a(18) added (from b-file) by _Jon E. Schoenfield_, Dec 17 2022