id:A090559 - OEIS Search Results

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Beginning with 2, least number such that concatenation of r copies of a(r), r = 1 to n is prime.

+0
2

2, 1, 3, 1, 9, 3 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`2,211,211333,2113331111,211333111199999 are all prime.`
	CROSSREFS	`Cf. A090560.` `Adjacent sequences: A090556 A090557 A090558 this_sequence A090560 A090561 A090562` `Sequence in context: A140966 A058036 A136179 this_sequence A126761 A098570 A122048`
	KEYWORD	`base,more,nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Dec 10 2003`

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Last modified October 12 15:26 EDT 2008. Contains 144830 sequences.