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Search: id:A075000
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| A075000 |
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Smallest number such that n*a(n) is a concatenation of n consecutive integers; or 0 if no such number exists. |
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+0
10
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| 1, 6, 41, 864, 2469, 20576, 493827, 7098637639, 13717421, 1234567891, 82737383012865106529, 10288065758426, 3513762316247164732, 563643651522439401227280, 8230452606740808761
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Conjecture: For every n there exists a nonzero a(n).
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LINKS
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Robert G. Wilson v, Table of n, a(n) for n = 0..100.
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EXAMPLE
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a(11) = 82737383012865106529 as 11*82737383012865106529 = 910111213141516171819 is the concatenation of 11 numbers from 9 to 19.
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MATHEMATICA
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f[ n_ ] := Block[ {id = Range@n}, While[ k = FromDigits@ Flatten@ IntegerDigits@ id/n; !IntegerQ@k, id++ ]; k ]; Array[ f, 16 ] - Robert G. Wilson v, Oct 19 2007
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CROSSREFS
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Cf. A074991, A074992, A074993, A074994, A074995, A074996, A036377, A073086, A074999, A075001.
Adjacent sequences: A074997 A074998 A074999 this_sequence A075001 A075002 A075003
Sequence in context: A006198 A113573 A007130 this_sequence A077307 A112960 A109856
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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), Aug 31 2002
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EXTENSIONS
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More terms from Rick L. Shepherd (rshepherd2(AT)hotmail.com), Sep 03 2002
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