id:A103045 - OEIS Search Results

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Numbers n such that 6*10^n + 8*R_n - 5 is prime, where R_n = 11...1 is the repunit (A002275) of length n.

+0
2

2, 3, 8, 50, 56, 72, 108, 132, 182, 1100, 1368, 1605, 5132 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Also numbers n such that (62*10^n-53)/9 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 688...883.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(62*10^n - 53)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A066084 A141319 A001289 this_sequence A126464 A041979 A001686` `Adjacent sequences: A103042 A103043 A103044 this_sequence A103046 A103047 A103048`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 18 2005`

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Last modified December 1 19:22 EST 2009. Contains 167811 sequences.