id:A134617 - OEIS Search Results

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Numbers such that the arithmetic mean of the squares of their prime factors is a prime.

+0
12

15, 20, 21, 28, 35, 39, 44, 48, 51, 52, 55, 65, 69, 85, 91, 92, 95, 108, 112, 115, 116, 129, 135, 141, 145, 159, 164, 172, 188, 189, 205, 208, 209, 215, 221, 225, 235, 236, 245, 249, 259, 268, 272, 295, 297, 299, 305, 309, 315, 316, 320, 325, 329, 339, 341, 365 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`a(1)=20, since 20=225 and (2*2^2+5^2)/3=33/3=11.`
	CROSSREFS	`Cf. A001597, A025475, A134333, A134344, A134376.` `Cf. A134600, A134602, A134605, A134608, A134613, A134619, A134621.` `Sequence in context: A032475 A133744 A031112 this_sequence A113529 A102495 A133288` `Adjacent sequences: A134614 A134615 A134616 this_sequence A134618 A134619 A134620`
	KEYWORD	`nonn`
	AUTHOR	`Hieronymus Fischer (Hieronymus.Fischer(AT)gmx.de), Nov 11 2007`

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

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