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A057138 Concatenate next digit at left hand end. 4
0, 1, 21, 321, 4321, 54321, 654321, 7654321, 87654321, 987654321, 987654321, 10987654321, 210987654321, 3210987654321, 43210987654321, 543210987654321, 6543210987654321, 76543210987654321, 876543210987654321 (list; graph; refs; listen; history; internal format)
OFFSET

0,3

FORMULA

a(n) =a(n-1)+10^(n-1)*n-10^n*floor[n/10] =A057139(n) mod 10^n.

CROSSREFS

Alternative progression for n >= 10 compared with A000422 and A014925. Cf. A057137 for reverse.

Sequence in context: A127424 A113531 A069572 * A104759 A138793 A014925

Adjacent sequences:  A057135 A057136 A057137 * A057139 A057140 A057141

KEYWORD

base,easy,nonn

AUTHOR

Henry Bottomley (se16(AT)btinternet.com), Aug 12 2000

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Last modified February 17 20:50 EST 2012. Contains 206085 sequences.