id:A102935 - OEIS Search Results

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

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1, 2, 4, 11, 13, 26, 154, 196, 436, 529, 1111, 2563, 2641, 3233, 3883, 4256, 9298 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Also numbers n such that (13*10^n+41)/9 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 144...449.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(13*10^n + 41)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A071069 A116439 A018525 this_sequence A038193 A002382 A023168` `Adjacent sequences: A102932 A102933 A102934 this_sequence A102936 A102937 A102938`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 16 2004`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.