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Search: id:A077189
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| A077189 |
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Smallest concatenation 123...(k-1) k (k-1)...321 (a concatenation of natural numbers from 1 to k and back to 1) that is a multiple of 2n-1, 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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COMMENT
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a(5k+3) = 0. Are there any other values of n so that a(n)=0?
The next value, 2n-1 = 17, has k = 109, for a total of 435 digits and is too large to include. - Frank Adams-Watters (FrankTAW(AT)Netscape.net), Jun 02 2006
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EXAMPLE
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a(5) = 12321 is a multiple of 9.
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CROSSREFS
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Cf. A077180, A077181, A077182, A077183, A077184, A077186, A077188, A077190.
Cf. A120008.
Sequence in context: A061745 A045084 A077186 this_sequence A104972 A091341 A077298
Adjacent sequences: A077186 A077187 A077188 this_sequence A077190 A077191 A077192
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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), Nov 01 2002
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EXTENSIONS
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More terms from Frank Adams-Watters (FrankTAW(AT)Netscape.net), Jun 02 2006
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