id:A093938 - OEIS Search Results

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Primes of the form 2*10^n + 7*R_n, where R_n is the repunit (A002275) of length n.

+0
1

2, 277, 2777, 2777777777, 2777777777777777, 2777777777777777777, 2777777777777777777777777777777777777, 2777777777777777777777777777777777777777777777777777777777777777 (list; graph; listen)

	OFFSET	`1,1`
	CROSSREFS	`Cf. A056702 (corresponding n).` `Adjacent sequences: A093935 A093936 A093937 this_sequence A093939 A093940 A093941` `Sequence in context: A135696 A008775 A119553 this_sequence A080296 A065498 A057746`
	KEYWORD	`nonn`
	AUTHOR	`Rick L. Shepherd (rshepherd2(AT)hotmail.com), Apr 17 2004`

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Last modified October 13 09:05 EDT 2008. Contains 145008 sequences.

AT&T Labs Research