id:A162296 - OEIS Search Results

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Sum of divisors that have a square factor

+0
1

0, 0, 0, 4, 0, 0, 0, 12, 9, 0, 0, 16, 0, 0, 0, 28, 0, 27, 0, 24, 0, 0, 0, 48, 25, 0, 36, 32, 0, 0, 0, 60, 0, 0, 0, 79, 0, 0, 0, 72, 0, 0, 0, 48, 54, 0, 0, 112, 49, 75, 0, 56, 0, 108, 0, 96, 0, 0, 0, 96, 0, 0, 72, 124, 0, 0, 0, 72, 0, 0, 0, 183, 0, 0, 100, 80, 0, 0, 0, 168, 117, 0, 0, 128, 0, 0 (list; graph; listen)

	OFFSET	`1,4`
	EXAMPLE	`a(8)=12 = 4 + 8`
	PROGRAM	`(PARI) a(n)=sumdiv(n, d, d*(1-moebius(d)^2)); v=vector(300, n, a(n))`
	CROSSREFS	`Cf. A048250.` `Sequence in context: A046782 A074037 A126849 this_sequence A057386 A099306 A101193` `Adjacent sequences: A162293 A162294 A162295 this_sequence A162297 A162298 A162299`
	KEYWORD	`easy,nonn`
	AUTHOR	`Joerg Arndt (arndt(AT)jjj.de), Jun 30 2009`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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