A103024 - OEIS

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A103024

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

1, 4, 8, 13, 16, 44, 439, 608, 1201, 2725, 5210, 59389, 118216, 198529 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`Also numbers n such that (53*10^n+1)/9 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 588...889.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(53*10^n + 1)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A061517 A058759 A032474 * A131041 A081843 A004938` `Adjacent sequences: A103021 A103022 A103023 * A103025 A103026 A103027`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 18 2005`
	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 14 18:09 EST 2012. Contains 205663 sequences.