A023509 - OEIS

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A023509

Greatest prime divisor of prime(n) + 1.

3, 2, 3, 2, 3, 7, 3, 5, 3, 5, 2, 19, 7, 11, 3, 3, 5, 31, 17, 3, 37, 5, 7, 5, 7, 17, 13, 3, 11, 19, 2, 11, 23, 7, 5, 19, 79, 41, 7, 29, 5, 13, 3, 97, 11, 5, 53, 7, 19, 23, 13, 5, 11, 7, 43, 11, 5, 17, 139, 47, 71, 7, 11, 13, 157, 53, 83, 13, 29, 7, 59, 5, 23, 17, 19, 3, 13 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	LINKS	`T. D. Noe, Table of n, a(n) for n = 1..10000`
	MATHEMATICA	`Table[FactorInteger[Prime[n] + 1][[-1, 1]], {n, 100}]`
	PROG	`(PARI) A023509(n) = {local(f); f=factor(prime(n)+1); f[matsize(f)[1], 1]} [From Michael B. Porter (michael_b_porter(AT)yahoo.com), Feb 02 2010]`
	CROSSREFS	`Sequence in context: A018837 A097618 A039639 * A115041 A039641 A198729` `Adjacent sequences: A023506 A023507 A023508 * A023510 A023511 A023512`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified February 17 14:50 EST 2012. Contains 206050 sequences.