A103029 - OEIS

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A103029

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

2, 260, 417, 953, 2138, 2969, 3045, 11777, 23648 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`Also numbers n such that (55*10^n+71)/9 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 611...119.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(55*10^n + 71)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A196288 A128697 A089663 * A122862 A137105 A007082` `Adjacent sequences: A103026 A103027 A103028 * A103030 A103031 A103032`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 18 2005`
	EXTENSIONS	`Addition of a(8)-a(9) from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 13 2010`

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Last modified February 17 07:41 EST 2012. Contains 205998 sequences.