A102976 - OEIS

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A102976

Numbers n such that 3*10^n + 7*R_n - 6 is prime, where R_n = 11...1 is the repunit (A002275) of length n.

0, 1, 5, 71, 112, 115, 173, 263, 310, 358, 10499, 22925 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,3`
	COMMENTS	`Also numbers n such that (34*10^n-61)/9 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 377...771.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(34*10^n-61)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A056266 A157860 A125242 * A141852 A142052 A139930` `Adjacent sequences: A102973 A102974 A102975 * A102977 A102978 A102979`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 17 2004`
	EXTENSIONS	`Addition of a(11)-a(12) from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 13 2010`

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Last modified February 14 13:08 EST 2012. Contains 205623 sequences.