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A033629
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Numbers that are not the sum of two distinct Ulam numbers.
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5
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23, 25, 33, 35, 43, 45, 67, 92, 94, 96, 111, 121, 136, 143, 160, 165, 170, 172, 187, 194, 204, 226, 231, 248, 265, 270, 280, 287, 292, 297, 302, 304, 314, 331, 336, 346, 348, 353, 368, 380, 397, 407, 419, 424, 446, 463, 468, 473, 475, 480, 490, 495, 507
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OFFSET
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1,1
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REFERENCES
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R. K. Guy, Unsolved Problems in Number Theory, C4
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LINKS
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MATHEMATICA
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terms = 1000; ulams = {1, 2};
Do[AppendTo[ulams, n = Last[ulams]; While[n++; Length[ DeleteCases[ Intersection[ ulams, n - ulams], n/2, 1, 1]] != 2]; n], {terms}];
uu = Total /@ Subsets[ulams, {2}] // Union;
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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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