id:A103038 - OEIS Search Results

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Numbers n such that 6*10^n + 5*R_n - 4 is prime, where R_n = 11...1 is the repunit (A002275) of length n.

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1, 3, 4, 10, 22, 40, 54, 81, 84, 106, 193, 597, 681, 1363, 1876, 4024 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Also numbers n such that (59*10^n-41)/9 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 655...551.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(59*10^n - 41)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A139797 A036649 A109887 this_sequence A143108 A014009 A085386` `Adjacent sequences: A103035 A103036 A103037 this_sequence A103039 A103040 A103041`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 18 2005`

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Last modified November 25 14:49 EST 2009. Contains 167514 sequences.