|
%I #15 Dec 17 2022 20:01:48
%S 4,10,84,1140,7140,125580,2929290,161226780,2875585020,32451432090,
%T 9117204216120,173092525291140,12728365882372140,6235727798083743960,
%U 843456728066008506450,68313970807402942762140,7219596660397839675355860,211677272048242059920400540
%N Smallest tetrahedral number with n distinct prime factors.
%H Donovan Johnson, <a href="/A156329/b156329.txt">Table of n, a(n) for n = 1..22</a>
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/TetrahedralNumber.html">Tetrahedral Numbers</a>.
%e 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 Cf. A000292.
%K nonn
%O 1,1
%A _Donovan Johnson_, Feb 08 2009
%E Edited by _Donovan Johnson_, Nov 24 2010
%E a(18) added (from b-file) by _Jon E. Schoenfield_, Dec 17 2022
| 