A102857 - OEIS

A102857

Sum of 1, 2 or 3 distinct tetrahedral numbers.

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

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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: A369654 A131855 A102858 * A102856 A285135 A037353

Adjacent sequences: A102854 A102855 A102856 * A102858 A102859 A102860

KEYWORD

nonn

AUTHOR

Jud McCranie, Mar 01 2005

STATUS

approved