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Search: id:A077187
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| A077187 |
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Smallest k such that the concatenation 123...(k-1) k (k-1)...321 ( a concatenation of natural numbers from 1 to k and back to 1) is a multiple of prime(n), or 0 if no such number exists. |
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+0
3
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OFFSET
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1,2
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EXAMPLE
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a(5) = 2 as 121 is a multiple of 11.
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CROSSREFS
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Cf. A077180, A077181, A077182, A077183, A077184, A077186, A077188.
Adjacent sequences: A077184 A077185 A077186 this_sequence A077188 A077189 A077190
Sequence in context: A007384 A077574 A071126 this_sequence A011079 A005928 A113062
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KEYWORD
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base,more,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Nov 01 2002
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EXTENSIONS
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3 more terms from Erich Friedman (efriedma(AT)stetson.edu), Aug 08 2005
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