id:A122118 - OEIS Search Results

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Least prime factor of 2^n+5^n.

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2, 7, 29, 7, 641, 7, 29, 7, 17, 7, 29, 7, 641, 7, 29, 7, 97, 7, 29, 7, 641, 7, 29, 7, 17, 7, 29, 7, 641, 7, 29, 7, 193, 7, 29, 7, 73, 7, 29, 7, 17, 7, 29, 7, 641, 7, 29, 7, 97, 7, 29, 7, 641, 7, 29, 7, 17, 7, 29, 7, 641, 7, 29, 7, 274568286337, 7, 29, 7, 137, 7, 29, 7, 17, 7, 29, 7, 457 (list; graph; listen)

	OFFSET	`0,1`
	COMMENT	`a(n_odd)=7, a(n=2+4k,k=0,1,...)=29, a(64)=274568286337 is unusially large. Cf. A074600 2^n + 5^n, A094475 Primes of form 2^n+5^n.`
	CROSSREFS	`Cf. A074600, A094475.` `Sequence in context: A123026 A013011 A013181 this_sequence A059803 A076043 A116968` `Adjacent sequences: A122115 A122116 A122117 this_sequence A122119 A122120 A122121`
	KEYWORD	`nonn`
	AUTHOR	`Zak Seidov (zakseidov(AT)yahoo.com), Oct 19 2006`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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