id:A121171 - OEIS Search Results

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Largest prime divisor of Lucas[5n], where Lucas[k] = A000032[k].

+0
5

11, 41, 31, 2161, 151, 2521, 911, 3041, 541, 570601, 39161, 20641, 24571, 12317523121, 18451, 23725145626561, 12760031, 10783342081, 87382901, 5738108801, 767131, 59996854928656801, 686551, 23735900452321, 28143378001 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Final digit of a(n) is 1. Mod[a(n),10] = 1. Final digit of many prime divisors of Lucas[5n] is 1.`
	MATHEMATICA	`Table[Max[Flatten[FactorInteger[Fibonacci[5n-1]+Fibonacci[5n+1]]]], {n, 1, 40}]`
	CROSSREFS	`Cf. A000032, A000045.` `Sequence in context: A065144 A089348 A088622 this_sequence A065079 A065049 A122015` `Adjacent sequences: A121168 A121169 A121170 this_sequence A121172 A121173 A121174`
	KEYWORD	`nonn`
	AUTHOR	`Alexander Adamchuk (alex(AT)kolmogorov.com), Aug 14 2006`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

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