id:A103109 - OEIS Search Results

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Numbers n such that 9*10^n + 8*R_n - 1 is prime, where R_n = 11...1 is the repunit (A002275) of length n.

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1, 3, 4, 6, 9, 12, 16, 34, 129, 243, 252, 529, 4885, 6363 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Also numbers n such that (89*10^n-17)/9 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 988...887.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(89*10^n - 17)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A022297 A010430 A097922 this_sequence A078743 A096846 A140570` `Adjacent sequences: A103106 A103107 A103108 this_sequence A103110 A103111 A103112`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 19 2005`

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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.