A102955 - OEIS

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A102955

Numbers n such that 2*10^n + 4*R_n + 5 is prime, where R_n = 11...1 is the repunit (A002275) of length n.

1, 15, 31, 73, 97, 499, 4207, 5902, 9568, 12142, 13048 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`Also numbers n such that (22*10^n+41)/9 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 244...449.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(22*10^n + 41)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A132757 A045135 A195046 * A041444 A041446 A042853` `Adjacent sequences: A102952 A102953 A102954 * A102956 A102957 A102958`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 17 2004`
	EXTENSIONS	`Addition of a(10)-a(11) from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 13 2010`

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Last modified February 15 16:39 EST 2012. Contains 205823 sequences.