id:A102932 - OEIS Search Results

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Numbers n such that 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, 2, 4, 5, 12, 60, 109, 181, 245, 412, 887, 2477, 2918, 4622, 6240, 6253, 7684 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Also numbers n such that (4*10^n+11)/3 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 133...337.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(4*10^n + 11)/3], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Adjacent sequences: A102929 A102930 A102931 this_sequence A102933 A102934 A102935` `Sequence in context: A117556 A091071 A050599 this_sequence A128457 A139485 A079407`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 16 2004`

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Last modified October 6 12:54 EDT 2008. Contains 144667 sequences.