A002097 Numbers that are not the sum of 3 nonzero triangular numbers.

1, 2, 4, 6, 11, 20, 29

Offset: 1

Author

N. J. A. Sloane, Dan Hoey

Keywords

• fini
• full
• nonn

Comments

A063993(a(n)) = 0. - Reinhard Zumkeller, Jul 20 2012

Crossrefs

Cf. A111638, A064825.

Programs

Mathematica

Complement[Range[30],Union[Total/@Tuples[Accumulate[Range[8]],3]]] (* Harvey P. Dale, Oct 06 2017 *)