id:A099411 - OEIS Search Results

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

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1, 2, 3, 6, 46, 394, 978, 2586, 2811, 2968, 3642, 4827, 4918, 5592, 5706 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Also numbers n such that (10^n+11)/3 is prime.`
	LINKS	`Index entries for primes involving repunits`
	MATHEMATICA	`Do[ If[ PrimeQ[ 3(10^n - 1)/9 + 4], Print[n]], {n, 10000}]`
	CROSSREFS	`Sequence in context: A127315 A018359 A049383 this_sequence A018372 A097350 A062309` `Adjacent sequences: A099408 A099409 A099410 this_sequence A099412 A099413 A099414`
	KEYWORD	`hard,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Oct 14 2004`

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Last modified December 6 22:55 EST 2009. Contains 170429 sequences.