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Search: id:A087341
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| A087341 |
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Smallest prime which is a concatenation of n successive composite numbers. |
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+0
1
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| 89, 138140141, 87889091, 8890919293, 141516182021, 122123124125126128129, 121122123124125126128129, 707274757677788081, 21222425262728303233, 206207208209210212213214215216217, 405406407408410411412413414415416417
(list; graph; listen)
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OFFSET
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2,1
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COMMENT
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a(3) contains three digit composite numbers as every concatenation of two digit numbers n,n+2 and n+3 is == 0 (mod 7).
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EXAMPLE
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a(2) = 89 is the concatenation of two successive composite numbers 8 and 9.
a(3) = 138140141 is the concatenation of 138,140 and 141.
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CROSSREFS
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Sequence in context: A080051 A072314 A087538 this_sequence A093405 A058631 A078293
Adjacent sequences: A087338 A087339 A087340 this_sequence A087342 A087343 A087344
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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), Sep 06 2003
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EXTENSIONS
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More terms from David Wasserman (wasserma(AT)spawar.navy.mil), May 10 2005
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