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Search: id:A092995
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| A092995 |
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Smallest prime of the form concatenation of prime(n) with itself followed by a 9, or 0 if no such prime exists. |
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+0
4
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| 29, 0, 59, 79, 11119, 139, 179, 199, 239, 29292929292929299, 31319, 379, 419, 439, 479, 0, 599, 619, 67679, 719, 739, 797979799, 839, 89899, 979797979, 1019, 1039, 1071071071079, 1091091091099, 1131139, 1279, 1319, 1371371371379, 1399, 1499
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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a(16)=0 since the concatenation of 53 with itself, followed by a 9, is always composite. a(36), if exists, has more than 12000 digits. - Giovanni Resta (g.resta(AT)iit.cnr.it), Apr 07 2006
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CROSSREFS
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Cf. A092992, A092993, A092994.
Sequence in context: A099090 A123269 A067158 this_sequence A040847 A040848 A040849
Adjacent sequences: A092992 A092993 A092994 this_sequence A092996 A092997 A092998
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KEYWORD
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base,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 28 2004
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EXTENSIONS
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More terms from Sam Alexander (amnalexander(AT)yahoo.com), Jan 09 2005
More terms from Giovanni Resta (g.resta(AT)iit.cnr.it), Apr 07 2006
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