id:A053634 - OEIS Search Results

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Sum_{ d divides n } phi(d)*2^(n/d)/(2n).

+0
4

2, 3, 4, 7, 10, 18, 30, 54, 94, 176, 316, 591, 1096, 2058, 3856, 7301, 13798, 26244, 49940, 95373, 182362, 349626, 671092, 1290714, 2485534, 4793790, 9256396, 17896284, 34636834, 67109898, 130150588, 252647064, 490853416, 954440950 (list; graph; listen)

	OFFSET	`3,1`
	CROSSREFS	`Cf. A000016, A053635.` `This is half A000031.` `Sequence in context: A082766 A082958 A060166 this_sequence A094863 A094862 A104722` `Adjacent sequences: A053631 A053632 A053633 this_sequence A053635 A053636 A053637`
	KEYWORD	`nonn`
	AUTHOR	`njas, Mar 23 2000`

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Last modified July 26 13:41 EDT 2008. Contains 142293 sequences.

AT&T Labs Research