id:A102970 - OEIS Search Results

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Numbers n such that 3*10^n + 4*R_n + 5 is prime, where R_n = 11...1 is the repunit (A002275) of length n.

+0
2

2, 3, 6, 12, 36, 39, 44, 90, 258, 512, 1482, 2378, 2406, 3224, 3378, 3876, 4161, 5510, 7425 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Also numbers n such that (31*10^n+41)/9 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 344...449.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(31*10^n+41)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A089430 A096746 A096203 this_sequence A144771 A054049 A111503` `Adjacent sequences: A102967 A102968 A102969 this_sequence A102971 A102972 A102973`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 17 2004`

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Last modified November 21 21:21 EST 2009. Contains 167310 sequences.