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A104759 Concatenation of digits of natural numbers from n down to 1. 19
1, 21, 321, 4321, 54321, 654321, 7654321, 87654321, 987654321, 1987654321, 1987654321, 101987654321, 1101987654321, 11101987654321, 211101987654321, 1211101987654321, 31211101987654321, 131211101987654321 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

LINKS

Eric Weisstein's World of Mathematics, Consecutive numbers sequences.

FORMULA

a(n) = A138793(n) mod 10^(n-1). - R. J. Mathar, Sep 17 2011

EXAMPLE

a(11) = a(10) because no number may begin with 0

CROSSREFS

Cf. A014925, A000422, A057138, A060554...

Sequence in context: A113531 A069572 A057138 * A138793 A014925 A000422

Adjacent sequences:  A104756 A104757 A104758 * A104760 A104761 A104762

KEYWORD

easy,nonn,base

AUTHOR

Alexandre Wajnberg & Juliette Bruyndonckx (alexandre.wajnberg(AT)ulb.ac.be), Apr 23 2005

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Last modified February 14 06:09 EST 2012. Contains 205570 sequences.