id:A102934 - OEIS Search Results

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

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1, 3, 4, 6, 9, 22, 28, 34, 37, 61, 82, 274, 276, 735, 1443, 2215, 2968, 3301, 3883, 3991, 5152, 8032, 8946 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Also numbers n such that (13*10^n+23)/9 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 144...447.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(13*10^n + 23)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A048577 A107340 A018830 this_sequence A095729 A050087 A079325` `Adjacent sequences: A102931 A102932 A102933 this_sequence A102935 A102936 A102937`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 16 2004`

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Last modified December 20 16:54 EST 2009. Contains 171081 sequences.