id:A062553 - OEIS Search Results

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Number of Abelian subgroups of dihedral group with 2n elements.

+0
2

2, 5, 5, 9, 7, 13, 9, 16, 12, 19, 13, 24, 15, 25, 19, 29, 19, 33, 21, 36, 25, 37, 25, 44, 28, 43, 31, 48, 31, 53, 33, 54, 37, 55, 39, 63, 39, 61, 43, 68, 43, 71, 45, 72, 51, 73, 49, 82, 52, 81, 55, 84, 55, 89, 59, 92, 61, 91, 61, 102, 63, 97, 69, 103, 69, 107, 69, 108, 73 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`a(n) = n+tau(n) if n is odd, 3/2*n+tau(n) if n is even, where tau(n)=the number of divisors of n, cf. A000005.`
	CROSSREFS	`Cf. A062249, A007503.` `Sequence in context: A014249 A145420 A152781 this_sequence A126357 A070243 A050175` `Adjacent sequences: A062550 A062551 A062552 this_sequence A062554 A062555 A062556`
	KEYWORD	`nonn`
	AUTHOR	`Ahmed Fares (ahmedfares(AT)my-deja.com), Jul 02 2001`
	EXTENSIONS	`Formula and more terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Jul 05 2001`

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.

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