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A082916 Numbers n such that n and C(2n,n) are relatively primes. +0
1
0, 1, 3, 5, 7, 9, 11, 13, 17, 19, 23, 25, 27, 29, 31, 37, 39, 41, 43, 47, 49, 53, 55, 59, 61, 67, 71, 73, 79, 81, 83, 89, 93, 97, 101, 103, 107, 109, 111, 113, 119, 121, 125, 127, 131, 137, 139, 149, 151, 155, 157, 161, 163, 167, 169, 173, 179, 181, 185, 191, 193, 197 (list; graph; listen)
OFFSET

1,3

FORMULA

It seems that a(n) is asymptotic to c*n*log(n) with 0.7<c<0.8

CROSSREFS

Adjacent sequences: A082913 A082914 A082915 this_sequence A082917 A082918 A082919

Sequence in context: A033040 A084820 A112372 this_sequence A098903 A061345 A080429

KEYWORD

nonn

AUTHOR

Benoit Cloitre (benoit7848c(AT)orange.fr), May 25 2003

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Last modified October 13 09:05 EDT 2008. Contains 145008 sequences.


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