id:A072993 - OEIS Search Results

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Numbers n such that phi(n) divides C(2n,n).

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1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 18, 21, 22, 26, 29, 30, 33, 35, 41, 42, 43, 44, 45, 52, 56, 60, 66, 67, 69, 70, 73, 74, 75, 76, 77, 78, 82, 86, 87, 88, 89, 92, 95, 99, 100, 105, 106, 110, 115, 116, 119, 122, 123, 124, 126, 127, 129, 133, 135, 138, 142, 143, 146 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`It seems that a(n) is asymptotic to C*n with C=2.3...`
	CROSSREFS	`Sequence in context: A050725 A080571 A082400 this_sequence A018444 A032378 A112881` `Adjacent sequences: A072990 A072991 A072992 this_sequence A072994 A072995 A072996`
	KEYWORD	`easy,nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Aug 21 2002`

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Last modified November 30 22:12 EST 2008. Contains 150989 sequences.

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