A133378 - OEIS

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A133378

a(1)=1. For n>=2, a(n) = the largest prime divisor of (a(n-1)^a(n-1) +1).

1, 2, 5, 521 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,2`
	LINKS	`Table of n, a(n) for n=1..4.`
	MATHEMATICA	`NestList[FactorInteger[#^#+1][[-1, 1]]&, 1, 3] (* Harvey P. Dale, Jun 21 2012 *)`
	CROSSREFS	`Cf. A007571.` `Sequence in context: A138696 A163798 A081296 * A283561 A037063 A068105` `Adjacent sequences: A133375 A133376 A133377 * A133379 A133380 A133381`
	KEYWORD	`more,nonn`
	AUTHOR	`Leroy Quet, Oct 28 2007`
	STATUS	`approved`

Last modified June 24 08:27 EDT 2021. Contains 345416 sequences. (Running on oeis4.)