id:A070007 - OEIS Search Results

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Arithmetical mean of distinct primes dividing n is a square number.

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15, 42, 45, 65, 75, 77, 84, 87, 126, 135, 141, 168, 225, 247, 252, 258, 261, 285, 294, 301, 325, 335, 336, 357, 375, 378, 405, 410, 423, 429, 481, 504, 516, 539, 588, 589, 591, 618, 671, 672, 675, 717, 756, 767, 774, 783, 785, 820, 845, 847, 855, 882, 986 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`n=1972=2.17.29: mean=(2+17+29)/3=48/3=16, a square.`
	CROSSREFS	`Cf. A070005, A070006, A001414, A008472.` `Sequence in context: A103003 A024845 A056698 this_sequence A051867 A008976 A072119` `Adjacent sequences: A070004 A070005 A070006 this_sequence A070008 A070009 A070010`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Apr 11 2002`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

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