A156329 Smallest tetrahedral number with n distinct prime factors.

4, 10, 84, 1140, 7140, 125580, 2929290, 161226780, 2875585020, 32451432090, 9117204216120, 173092525291140, 12728365882372140, 6235727798083743960, 843456728066008506450, 68313970807402942762140, 7219596660397839675355860, 211677272048242059920400540

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: A371021 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

a(18) added (from b-file) by Jon E. Schoenfield, Dec 17 2022

Status

approved