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A094333 a(1) = 1, a(n) = least proper multiple of a(n-1) which is a concatenation of successive numbers. Terms with more than one digit must be a concatenation of at least two successive numbers. 3
1, 2, 4, 8, 56, 5152, 17181920, 479839479840, 552587148319552587148320, 370210294386175240152319370210294386175240152320 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Paul Tek, Table of n, a(n) for n = 1..14

EXAMPLE

a(3) = 4 is the smallest proper multiple of 2 which is a concatenation of a (single) number.

a(5) = 56 and a(6) = 5152 =56*92 is the concatenation of 51 and 52.

CROSSREFS

Cf. A035333, A094334, A225796.

Sequence in context: A068620 A073953 A206850 * A018473 A004094 A028910

Adjacent sequences:  A094330 A094331 A094332 * A094334 A094335 A094336

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, May 16 2004

EXTENSIONS

a(7), a(8) from D. S. McNeil, Mar 23 2009

a(9) from Donovan Johnson, Mar 09 2011

a(10) from Paul Tek, Jul 27 2013

STATUS

approved

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Last modified February 20 22:51 EST 2019. Contains 320362 sequences. (Running on oeis4.)