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A196990 Numbers that are not the sum of two powers of 3. 0
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 (list; graph; refs; listen; history; text; internal format)
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: A183868 A299542 A144724 * A060462 A072668 A249433

Adjacent sequences:  A196987 A196988 A196989 * A196991 A196992 A196993

KEYWORD

nonn

AUTHOR

Jeremy Gardiner, Oct 08 2011

STATUS

approved

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Last modified February 19 09:57 EST 2020. Contains 332041 sequences. (Running on oeis4.)