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A117140
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a(1)=5, a(2)=7; for n >= 3, a(n) is smallest number which is uniquely of the form a(j)+a(k) with 1<=j<k<n.
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2
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5, 7, 12, 17, 19, 22, 26, 27, 32, 33, 36, 37, 40, 42, 46, 50, 56, 60, 66, 70, 71, 74, 81, 85, 91, 99, 101, 132, 138, 140, 150, 154, 156, 158, 160, 179, 181, 185, 189, 195, 205, 209, 233, 234, 236, 240, 248, 258, 264, 268, 287, 289, 293, 297, 303, 336, 340, 342, 348
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OFFSET
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1,1
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COMMENTS
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An Ulam-type sequence - see A002858 for many further references, comments, etc.
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LINKS
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MATHEMATICA
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PROG
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(Haskell)
a117140 n = a117140_list !! (n-1)
a117140_list = 5 : 7 : ulam 2 7 a117140_list
-- Function ulam as defined in A002858.
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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