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Search: id:A080384
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| A080384 |
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Numbers n such that the number of k for which the C[n,Floor(n/2)]/C[n,k] quotient is an integer equals six; i.e. A080383(n)=6. |
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3
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| 5, 7, 9, 11, 15, 17, 19, 21, 23, 27, 29, 33, 35, 39, 43, 45, 47, 49, 51, 53, 55, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 87, 89, 93, 95, 97, 99, 101, 103, 105, 107, 109, 111, 113, 115, 117, 119, 121, 123, 125, 127, 129, 131, 135, 137, 139, 141, 143, 145
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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for n=9:central binomial coefficient(=126) is divisible by C[9,0],C[9,1],C[9,4],C[9,5],C[9,8],C[9,9]; certain primes are missing, certain composites are here.
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CROSSREFS
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Cf. A001405, A080383-A080388.
Adjacent sequences: A080381 A080382 A080383 this_sequence A080385 A080386 A080387
Sequence in context: A049758 A064077 A026282 this_sequence A086398 A023380 A076190
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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 12 2003
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