id:A096870 - OEIS Search Results

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Difference between the n-th repunit and the previous prime.

+0
4

4, 2, 2, 18, 2, 20, 10, 2, 14, 52, 8, 18, 58, 58, 72, 4, 20, 74, 84, 58, 14, 18, 82, 168, 28, 50, 168, 84, 8, 138, 112, 82, 2, 28, 2, 62, 34, 50, 74, 24, 8, 54, 204, 22, 428, 40, 118, 200, 72, 40, 30, 42, 284, 44, 114, 268, 80, 18, 4, 74, 142, 182, 140, 112, 214, 152, 90 (list; graph; listen)

	OFFSET	`2,1`
	FORMULA	`a(n) = A002275(n) - A096498(n) = A096499(n) - A096869(n).`
	MATHEMATICA	`PrevPrim[n_] := Block[{k = n - 1}, While[ !PrimeQ[k], k-- ]; k]; Table[(10^n - 1)/9 - PrevPrim[(10^n - 1)/9], {n, 2, 70}]`
	CROSSREFS	`Cf. A096869.` `Sequence in context: A055630 A136202 A075418 this_sequence A134977 A145326 A016513` `Adjacent sequences: A096867 A096868 A096869 this_sequence A096871 A096872 A096873`
	KEYWORD	`nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jul 12 2004`

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Last modified December 10 00:48 EST 2009. Contains 170565 sequences.

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