id:A103039 - OEIS Search Results

Search: id:A103039

Displaying 1-1 of 1 results found.

page 1

Numbers n such that 6*10^n + 5*R_n - 2 is prime, where R_n = 11...1 is the repunit (A002275) of length n.

+0
2

2, 3, 9, 11, 12, 15, 36, 38, 41, 77, 90, 96, 132, 374, 399, 617, 1332, 1395, 1811, 2804, 4953, 5310 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Also numbers n such that (59*10^n-23)/9 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 655...553.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(59*10^n - 23)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A109636 A057236 A063257 this_sequence A140222 A121557 A138984` `Adjacent sequences: A103036 A103037 A103038 this_sequence A103040 A103041 A103042`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 18 2005`

page 1

Search completed in 0.002 seconds

Last modified November 24 23:16 EST 2009. Contains 167481 sequences.