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A072823
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Numbers that are not the sum of two powers of 2.
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7
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1, 7, 11, 13, 14, 15, 19, 21, 22, 23, 25, 26, 27, 28, 29, 30, 31, 35, 37, 38, 39, 41, 42, 43, 44, 45, 46, 47, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 67, 69, 70, 71, 73, 74, 75, 76, 77, 78, 79, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 97
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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COMMENTS
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1 and integers with three or more 1-bits in their binary expansion. - Vladimir Baltic, Jul 23 2002
Appears to be the numbers k >1 for which there exist an x and y (x>y) such that x OR y = k, x+y != k, and x<k. - Gary Detlefs, Jun 02 2014
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LINKS
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MAPLE
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f:= x -> convert(convert(x, base, 2), `+`)>2:
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MATHEMATICA
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PROG
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(Haskell)
a072823 n = a072823_list !! (n-1)
a072823_list = tail $ elemIndices 0 a073267_list
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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