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Search: id:A080393
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| 0, 1, 2, 3, 40, 5, 12, 25, 1122, 13, 420, 1103
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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It is undecided whether all positive integers arise here or not.
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EXAMPLE
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a(1)=0; parity of n and a(n) is opposite; n=10: a(10)=13 because in A080383 10 appears first as 13th term; extension: a(14)=421
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MATHEMATICA
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f[x_] := Count[Table[IntegerQ[Binomial[x, Floor[x/2]]/ Binomial[x, j]], {j, 0, n}], True]; t=Table[0, {20}]; Do[s=f[n]; If[s<21&&t[[s]]==0, t[[s]]=n], {n, 1, 1300}]; t
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CROSSREFS
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Cf. A080383, A080385(1)=a(7), A080386(1)=a(8), A080387(1)=a(10), A080384(1)=a(6).
Sequence in context: A060813 A039820 A076724 this_sequence A111683 A088984 A097170
Adjacent sequences: A080390 A080391 A080392 this_sequence A080394 A080395 A080396
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Mar 17 2003
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