id:A139717 - OEIS Search Results

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If k is the smallest divisor of n that is >= sqrt(n) then a(n) = k^2 - n.

+0
2

0, 2, 6, 0, 20, 3, 42, 8, 0, 15, 110, 4, 156, 35, 10, 0, 272, 18, 342, 5, 28, 99, 506, 12, 0, 143, 54, 21, 812, 6, 930, 32, 88, 255, 14, 0, 1332, 323, 130, 24, 1640, 7, 1806, 77, 36, 483, 2162, 16, 0, 50, 238, 117, 2756, 27, 66, 8, 304, 783, 3422, 40, 3660, 899, 18, 0 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`a(p) = p*(p-1) for all primes p. a(n^2) = 0 for all positive integers n.`
	LINKS	`Leroy Quet, Home Page (listed in lieu of email address)`
	CROSSREFS	`Cf. A139716, A033677.` `Sequence in context: A065344 A131105 A057635 this_sequence A138703 A106458 A122685` `Adjacent sequences: A139714 A139715 A139716 this_sequence A139718 A139719 A139720`
	KEYWORD	`nonn`
	AUTHOR	`Leroy Quet May 01 2008`
	EXTENSIONS	`Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Jul 01 2009`

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Last modified December 9 14:43 EST 2009. Contains 170430 sequences.

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