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Search: id:A090559
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A090559 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.


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