A103059 - OEIS

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A103059

Numbers n such that 7*10^n + 4*R_n + 5 is prime, where R_n = 11...1 is the repunit (A002275) of length n.

1, 4, 7, 34, 82, 451, 772, 2554, 6250, 15137, 20074 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`Also numbers n such that (67*10^n+41)/9 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 744...449.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(67*10^n + 41)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A153062 A143547 A149090 * A123809 A140981 A124624` `Adjacent sequences: A103056 A103057 A103058 * A103060 A103061 A103062`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 19 2005`
	EXTENSIONS	`a(10)-a(11) from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 14 2010`

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Last modified February 17 03:45 EST 2012. Contains 205978 sequences.