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A156329
Smallest tetrahedral number with n distinct prime factors.
7
4, 10, 84, 1140, 7140, 125580, 2929290, 161226780, 2875585020, 32451432090, 9117204216120, 173092525291140, 12728365882372140, 6235727798083743960, 843456728066008506450, 68313970807402942762140, 7219596660397839675355860, 211677272048242059920400540
OFFSET
1,1
LINKS
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
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