A102944 - OEIS

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A102944

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

1, 16, 22, 28, 34, 90, 2068, 2374, 2854, 3720, 4242, 22666, 29292, 29508 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`Also numbers n such that (17*10^n-53)/9 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 188...883.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(17*10^n - 53)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A065778 A091118 A064804 * A058901 A059756 A154877` `Adjacent sequences: A102941 A102942 A102943 * A102945 A102946 A102947`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 16 2004`
	EXTENSIONS	`Addition of a(12)-a(14) from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 12 2010`

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Last modified February 15 20:59 EST 2012. Contains 205852 sequences.