id:A069827 - OEIS Search Results

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Numbers n such that sigma(core(n))=tau(n) where core(x) is the square-free part of x and tau(x) the number of divisors of x.

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1, 20, 27, 45, 96, 150, 245, 294, 486, 504, 540, 605, 612, 726, 832, 845, 1014, 1400, 1445, 1500, 1700, 1734, 1805, 2166, 2645, 3125, 3168, 3174, 3332, 3825, 4176, 4205, 4352, 4805, 4950, 5046, 5324, 5766, 6174, 6615, 6776, 6845, 7497, 8214, 8228, 8405 (list; graph; listen)

	OFFSET	`1,2`
	CROSSREFS	`Sequence in context: A101070 A070717 A114813 this_sequence A059617 A122146 A032482` `Adjacent sequences: A069824 A069825 A069826 this_sequence A069828 A069829 A069830`
	KEYWORD	`easy,nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 28 2002`

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Last modified December 7 23:50 EST 2009. Contains 170430 sequences.

AT&T Labs Research