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A102857 Sum of 1, 2 or 3 distinct tetrahedral numbers. 9
1, 4, 5, 10, 11, 14, 15, 20, 21, 24, 25, 30, 31, 34, 35, 36, 39, 40, 45, 46, 49, 55, 56, 57, 59, 60, 61, 65, 66, 67, 70, 76, 77, 80, 84, 85, 86, 88, 89, 91, 92, 94, 95, 98, 101, 104, 105, 108, 111, 114, 119, 120, 121, 123, 124, 125, 129, 130, 131, 134, 139 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..61.

MATHEMATICA

Module[{nn=10, tetra}, tetra=Table[(n(n+1)(n+2))/6, {n, nn}]; Rest[Union[ Total/@ Subsets[tetra, 3]]]] (* Harvey P. Dale, Nov 17 2017 *)

CROSSREFS

Cf. A104246, A102795-A102806, A102855-A102858.

Sequence in context: A199134 A131855 A102858 * A102856 A285135 A037353

Adjacent sequences:  A102854 A102855 A102856 * A102858 A102859 A102860

KEYWORD

nonn

AUTHOR

Jud McCranie, Mar 01 2005

STATUS

approved

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Last modified November 15 11:18 EST 2019. Contains 329144 sequences. (Running on oeis4.)