id:A080051 - OEIS Search Results

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Common factors of 2^p-1 and the p-th Fibonacci number, p prime.

+0
3

89, 680081, 260809, 3146161, 1170641, 123209, 423769, 153689, 156329, 179849, 779489, 403889, 208889, 235289, 246809, 279689, 864169, 2376809, 346649, 728369, 1108489, 372809, 380729, 403289, 458009, 1392649, 488009, 503369, 505049 (list; graph; listen)

	OFFSET	`0,1`
	COMMENT	`The shown members of the sequence are all prime.`
	FORMULA	`a(n)=gcd(2^A080050(n)-1, fibonacci(A080050(n))).`
	EXAMPLE	`Example: A080050(1)=11 and 89 divides both 2^11-1=2047 and F(11)=89, so 89 is in the sequence.`
	CROSSREFS	`Cf. A074776, A079506, A080050.` `Sequence in context: A136031 A145098 A145097 this_sequence A072314 A087538 A087341` `Adjacent sequences: A080048 A080049 A080050 this_sequence A080052 A080053 A080054`
	KEYWORD	`nonn`
	AUTHOR	`Ralf Stephan (ralf(AT)ark.in-berlin.de), Jan 22 2003`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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