id:A072680 - OEIS Search Results

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Difference between (least prime >= n) and (largest prime <= n).

+0
3

0, 0, 2, 0, 2, 0, 4, 4, 4, 0, 2, 0, 4, 4, 4, 0, 2, 0, 4, 4, 4, 0, 6, 6, 6, 6, 6, 0, 2, 0, 6, 6, 6, 6, 6, 0, 4, 4, 4, 0, 2, 0, 4, 4, 4, 0, 6, 6, 6, 6, 6, 0, 6, 6, 6, 6, 6, 0, 2, 0, 6, 6, 6, 6, 6, 0, 4, 4, 4, 0, 2, 0, 6, 6, 6, 6, 6, 0, 4, 4, 4, 0, 6, 6, 6, 6, 6, 0, 8, 8, 8, 8, 8, 8, 8, 0, 4, 4, 4, 0, 2, 0, 4, 4, 4 (list; graph; listen)

	OFFSET	`2,3`
	COMMENT	`a(n)=0 iff n is prime.`
	FORMULA	`a(n) = A057427(n - A007917(n)) * A001223(A049084(A007917(n))).`
	PROGRAM	`(Mupad) numlib::prevprime(i)(-1)-nextprime(i)(-1)$ i = 2..106 - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Feb 26 2007`
	CROSSREFS	`a(n) = A007918(n) - A007917(n).` `Cf. A072681, A013633.` `Sequence in context: A051629 A052120 A029186 this_sequence A067770 A079200 A011420` `Adjacent sequences: A072677 A072678 A072679 this_sequence A072681 A072682 A072683`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jul 01 2002`

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Last modified December 1 19:22 EST 2009. Contains 167811 sequences.

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