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Search: id:A092993
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| A092993 |
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Smallest prime of the form concatenation of prime(n) with itself followed by a 3, or 0 if no such prime exists. |
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+0
4
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| 23, 0, 53, 73, 113, 13131313133, 173, 193, 233, 293, 313, 373, 41413, 433, 47474747474747474747474747473, 53535353535353535353535353533, 593, 613, 673, 71713, 733, 0, 83833, 89898989893, 97973, 1013, 1033, 1071071071073, 1093
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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a(22)=0 since the concatenation of 79 with itself, followed by a 3, is always composite. - Giovanni Resta (g.resta(AT)iit.cnr.it), Apr 07 2006
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CROSSREFS
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Cf. A092992, A092994, A092995.
Sequence in context: A119566 A143196 A143197 this_sequence A114784 A141517 A040534
Adjacent sequences: A092990 A092991 A092992 this_sequence A092994 A092995 A092996
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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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a(15)-a(21) from Stefan Steinerberger (hansibal(AT)hotmail.com), Nov 09 2005
More terms from Giovanni Resta (g.resta(AT)iit.cnr.it), Apr 07 2006
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