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 A156329 Smallest tetrahedral number with n distinct prime factors. 2

%I

%S 4,10,84,1140,7140,125580,2929290,161226780,2875585020,32451432090,

%T 9117204216120,173092525291140,12728365882372140,6235727798083743960,

%U 843456728066008506450,68313970807402942762140,7219596660397839675355860

%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

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Last modified June 22 07:09 EDT 2021. Contains 345374 sequences. (Running on oeis4.)