id:A102989 - OEIS Search Results

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

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1, 3, 5, 6, 8, 15, 26, 53, 60, 97, 183, 205, 302, 396, 456, 467, 607, 828, 1860, 2743, 4273, 4781, 5712, 6038, 6637, 9222 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Also numbers n such that (13*10^n+11)/3 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 433...337.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(13*10^n + 11)/3], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A039869 A076210 A039014 this_sequence A005623 A016612 A098587` `Adjacent sequences: A102986 A102987 A102988 this_sequence A102990 A102991 A102992`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 17 2005`

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Last modified July 24 12:00 EDT 2008. Contains 142294 sequences.