id:A109637 - OEIS Search Results

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Numbers n such that the string 55n is prime.

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7, 19, 21, 27, 31, 57, 63, 69, 73, 81 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`If n=7 then 55n = 557 which is a prime.` `If n=81 then 55n = 5581 which is a prime.`
	CROSSREFS	`Sequence in context: A052256 A064819 A102167 this_sequence A039513 A125265 A123532` `Adjacent sequences: A109634 A109635 A109636 this_sequence A109638 A109639 A109640`
	KEYWORD	`nonn`
	AUTHOR	`Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Aug 30 2005`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.