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Search: id:A068697
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| A068697 |
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Smallest prime which is a concatenation of n consecutive odd numbers. If no such prime exists then 0. |
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+0
1
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| 3, 13, 0, 23252729, 2527293133, 0, 57911131517, 4547495153555759, 0, 135791113151719, 87899193959799101103105107, 0, 23252729313335373941434547, 357911131517192123252729, 0
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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a(3k) = 0.
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EXAMPLE
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a(4) = 23252729 as a concatenation of 23,25,27 and 29. a(3) = 0 for a concatenation of 3 odd numbers is always a multiple of 3.
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CROSSREFS
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Cf. A052077.
Sequence in context: A102945 A132515 A036300 this_sequence A010258 A107774 A122478
Adjacent sequences: A068694 A068695 A068696 this_sequence A068698 A068699 A068700
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KEYWORD
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base,hard,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 03 2002
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EXTENSIONS
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More terms from Sascha Kurz (sascha.kurz(AT)uni-bayreuth.de), Mar 26 2002
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