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Search: id:A092994
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| A092994 |
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Smallest prime of the form concatenation of prime(n) with itself followed by a 7, or 0 if no such prime exists. |
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+0
4
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| 227, 37, 557, 0, 11117, 137, 17171717171717171717171717171717171717171717171717177, 197, 23232323232323237, 29297, 317, 0, 41414141414141414141414141414141414141414141417
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OFFSET
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1,1
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COMMENT
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a(12)=0 since the concatenation of 37 with itself, followed by a 7, is always composite. a(14), the term relative to 43, is a prime with 1089 digits. - Giovanni Resta (g.resta(AT)iit.cnr.it), Apr 07 2006
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CROSSREFS
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Cf. A092992, A092993, A092995.
Sequence in context: A031603 A050847 A098247 this_sequence A031513 A078765 A142261
Adjacent sequences: A092991 A092992 A092993 this_sequence A092995 A092996 A092997
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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 Giovanni Resta (g.resta(AT)iit.cnr.it), Apr 07 2006
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