A002097 - OEIS

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A002097

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

7

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

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

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

LINKS

Table of n, a(n) for n=1..7.

MATHEMATICA

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

CROSSREFS

Cf. A111638, A064825.

Sequence in context: A164137 A018170 A113913 * A026757 A026385 A254532

Adjacent sequences: A002094 A002095 A002096 * A002098 A002099 A002100

KEYWORD

fini,full,nonn

AUTHOR

N. J. A. Sloane, Dan Hoey

STATUS

approved