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A156329 Smallest tetrahedral number with n distinct prime factors. 2
4, 10, 84, 1140, 7140, 125580, 2929290, 161226780, 2875585020, 32451432090, 9117204216120, 173092525291140, 12728365882372140, 6235727798083743960, 843456728066008506450, 68313970807402942762140, 7219596660397839675355860 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Donovan Johnson, Table of n, a(n) for n = 1..22

Eric Weisstein's World of Mathematics, Tetrahedral Numbers.

EXAMPLE

a(9) = 2875585020 = 2^2*3*5*7*11*17*19*41*47. 2875585020 is the smallest tetrahedral number with 9 distinct prime factors.

CROSSREFS

Cf. A000292.

Sequence in context: A215872 A059919 A143047 * A266839 A203179 A125855

Adjacent sequences:  A156326 A156327 A156328 * A156330 A156331 A156332

KEYWORD

nonn

AUTHOR

Donovan Johnson, Feb 08 2009

EXTENSIONS

Edited by Donovan Johnson, Nov 24 2010

STATUS

approved

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Last modified May 6 14:16 EDT 2021. Contains 343586 sequences. (Running on oeis4.)