A196990 Numbers that are not the sum of two powers of 3.

1, 3, 5, 7, 8, 9, 11, 13, 14, 15, 16, 17, 19, 20, 21, 22, 23, 24, 25, 26, 27, 29, 31, 32, 33, 34, 35, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76

Offset

1,2

Comments

Complement of A055235 (sums of two powers of 3)

Links

Table of n, a(n) for n=1..66.

Example

a(2)=3 because 3 cannot be expressed as the sum of two powers of 3

Crossrefs

Cf. A055235, A072823.

Sequence in context: A346232 A299542 A144724 * A060462 A072668 A249433

Adjacent sequences: A196987 A196988 A196989 * A196991 A196992 A196993

Keyword

nonn

Author

Jeremy Gardiner, Oct 08 2011

Status

approved