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A074108 Smallest number such that the concatenation of first n terms is a proper multiple of the concatenation of first n natural numbers. 0
2, 4, 6, 8, 13585, 81504, 959339, 3715372, 78137091, 2037878170, 861472331456, 35628332614704, 2509243979641006, 97463093398309010, 52748900893862397840, 7355609995400651988940, 1755796374216684779591144, 71520859355651043708177774 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..17.

EXAMPLE

24 = 8*12, 246 = 2*123, 2468= 2*1234, 246813585 = 19993*12345 and 246813585 is a concatenation of first five terms.

CROSSREFS

Sequence in context: A030149 A083146 A306091 * A231408 A021409 A283501

Adjacent sequences:  A074105 A074106 A074107 * A074109 A074110 A074111

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, Aug 26 2002

EXTENSIONS

Corrected and extended by Max Alekseyev, May 11 2009

STATUS

approved

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Last modified May 26 10:17 EDT 2022. Contains 354086 sequences. (Running on oeis4.)