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A111381 Least multiple of n as a concatenation of two successive natural numbers k and k+1. 2
10, 10, 12, 12, 10, 12, 21, 32, 45, 910, 1617, 1716, 65, 56, 45, 32, 34, 54, 76, 1920, 1617, 1716, 1817, 1920, 2425, 78, 54, 56, 87, 1110, 2728, 1312, 1617, 3332, 910, 3132, 1110, 76, 78, 1920, 1312, 3738, 2021, 1716, 4140, 4140, 2021, 1920, 98 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

'Multiple' means >1 and we allow either left-to-right or right-to-left concatenations.

LINKS

Paul Tek, Table of n, a(n) for n = 1..10000

CROSSREFS

Cf. A113595.

Sequence in context: A280105 A063697 A173198 * A063660 A175220 A272479

Adjacent sequences:  A111378 A111379 A111380 * A111382 A111383 A111384

KEYWORD

base,nonn

AUTHOR

Hans Havermann, Nov 08 2005

STATUS

approved

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Last modified May 10 22:35 EDT 2021. Contains 343780 sequences. (Running on oeis4.)