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A074108
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Smallest number such that the concatenation of first n terms is a proper multiple of the concatenation of first n natural numbers.
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0
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2, 4, 6, 8, 13585, 81504, 959339, 3715372, 78137091, 2037878170, 861472331456, 35628332614704, 2509243979641006, 97463093398309010, 52748900893862397840, 7355609995400651988940, 1755796374216684779591144, 71520859355651043708177774
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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EXAMPLE
| 24 = 8*12, 246 = 2*123, 2468= 2*1234, 246813585 = 19993*12345 and 246813585 is a concatenation of first five terms.
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CROSSREFS
| Sequence in context: A087302 A030149 A083146 * A021409 A176461 A084407
Adjacent sequences: A074105 A074106 A074107 * A074109 A074110 A074111
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KEYWORD
| base,nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Aug 26 2002
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EXTENSIONS
| Corrected and extended by Max Alekseyev (maxale(AT)gmail.com), May 11 2009
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