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A072099
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First term = 1 and, for each n > 1, n*a(n) does not appear.
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2
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1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21, 22, 23, 24, 25, 26, 27, 28, 29, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77
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OFFSET
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1,2
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COMMENTS
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Does lim_{n->infinity} (a(n)-n)/sqrt(n) = 1?
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LINKS
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EXAMPLE
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a(2) = 2 so 2*2 = 4 is not in the sequence. a(4) = 5 so 4*5 = 20 is not in the sequence. There is no n such that n*a(n) = 3, so 3 is in the sequence.
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MATHEMATICA
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Nest[Append[#, Min@Complement[Range[#[[-1]]*Length@# + 1], #, #*Range@Length@#]] &, {1}, 70] (* Ivan Neretin, Dec 20 2017 *)
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CROSSREFS
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KEYWORD
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easy,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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