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Search: id:A068680
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A068680 Primes formed by the concatenation n, n+2, n. +0
3
131, 353, 797, 171917, 232523, 272927, 293129, 313331, 333533, 373937, 495149, 515351, 575957, 596159, 616361, 636563, 676967, 737573, 777977, 798179, 838583, 878987, 899189, 103105103, 109111109, 111113111, 129131129, 133135133 (list; graph; listen)
OFFSET

1,1

EXAMPLE

109111109 is a term as it is the concatenation of 109, 111 and 109.

CROSSREFS

Sequence in context: A117477 A089316 A142129 this_sequence A142555 A118507 A105837

Adjacent sequences: A068677 A068678 A068679 this_sequence A068681 A068682 A068683

KEYWORD

base,easy,nonn

AUTHOR

Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 02 2002

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.


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