id:A069164 - OEIS Search Results

Search: id:A069164

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Numbers n such that n*sum(d|n,1/tau(d)) is an integer.

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1, 2, 12, 20, 24, 28, 36, 40, 44, 52, 56, 68, 72, 76, 80, 88, 92, 104, 116, 124, 136, 148, 152, 160, 164, 172, 184, 188, 212, 232, 236, 240, 244, 248, 268, 284, 292, 296, 316, 328, 332, 344, 356, 376, 388, 404, 412, 424, 428, 432, 436, 452, 472, 480, 488, 508 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`n such that n*sum(d\|n, 1/A000005(d)) is an integer`
	CROSSREFS	`Sequence in context: A043497 A051804 A121022 this_sequence A067762 A137311 A032407` `Adjacent sequences: A069161 A069162 A069163 this_sequence A069165 A069166 A069167`
	KEYWORD	`easy,nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 09 2002`

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Last modified December 2 15:58 EST 2008. Contains 150992 sequences.

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