id:A064916 - OEIS Search Results

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a(n) = n / lpf(n) + lpf(n) - 1, where lpf = A020639 = least prime factor.

+0
5

2, 3, 3, 5, 4, 7, 5, 5, 6, 11, 7, 13, 8, 7, 9, 17, 10, 19, 11, 9, 12, 23, 13, 9, 14, 11, 15, 29, 16, 31, 17, 13, 18, 11, 19, 37, 20, 15, 21, 41, 22, 43, 23, 17, 24, 47, 25, 13, 26, 19, 27, 53, 28, 15, 29, 21, 30, 59, 31, 61, 32, 23, 33, 17, 34, 67, 35, 25, 36, 71, 37, 73, 38, 27 (list; graph; listen)

	OFFSET	`2,1`
	COMMENT	`a(n) = A032742(n) + A020639(n) - 1; a(n) <= n and for n > 1 a(n) = n iff n is prime.`
	EXAMPLE	`a(18) = 18 / 2 + 2 - 1 = 10; a(19) = 19 / 19 + 19 - 1 = 19.`
	CROSSREFS	`Cf. A064920, A064917, A064918, A032742, A020639, A064919.` `Sequence in context: A135533 A119674 A064920 this_sequence A062854 A057859 A029579` `Adjacent sequences: A064913 A064914 A064915 this_sequence A064917 A064918 A064919`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Oct 14 2001`

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Last modified December 3 16:57 EST 2008. Contains 151279 sequences.

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