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A057815
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a(n)=GCD[n,C(n,[n/2])].
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0
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1, 2, 3, 2, 5, 2, 7, 2, 9, 2, 11, 12, 13, 2, 15, 2, 17, 2, 19, 4, 21, 2, 23, 4, 25, 2, 27, 4, 29, 30, 31, 2, 33, 2, 35, 12, 37, 2, 39, 20, 41, 6, 43, 4, 45, 2, 47, 12, 49, 2, 51, 4, 53, 2, 55, 56, 57, 2, 59, 4, 61, 2, 63, 2, 65, 6, 67, 4, 69, 14, 71, 4, 73, 2, 75, 4, 77, 2, 79, 20, 81, 2
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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EXAMPLE
| a(2k+1)=2k+1. For even n, a(n) is an even divisor of n: a(2k)=2,2,2,2,12,2,2,2,4,... as in A058005.
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CROSSREFS
| Cf. A001405.
Sequence in context: A141310 A007389 A007388 * A007387 A094757 A095171
Adjacent sequences: A057812 A057813 A057814 * A057816 A057817 A057818
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KEYWORD
| nonn
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AUTHOR
| Labos E. (labos(AT)ana.sote.hu), Nov 13 2000
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