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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
OFFSET
1,2
COMMENTS
Complement of A055235 (sums of two powers of 3)
EXAMPLE
a(2)=3 because 3 cannot be expressed as the sum of two powers of 3
CROSSREFS
Sequence in context: A346232 A299542 A144724 * A060462 A072668 A249433
KEYWORD
nonn
AUTHOR
Jeremy Gardiner, Oct 08 2011
STATUS
approved