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A061772 Number of n-digit multiples of n. 4
10, 45, 300, 2250, 18000, 150000, 1285714, 11250000, 100000000, 900000000, 8181818181, 75000000000, 692307692307, 6428571428571, 60000000000000, 562500000000000, 5294117647058824 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..17.

FORMULA

a(n) = floor [{9*10^(n-1}/n] or floor [{9*10^(n-1)}/n] + 1.

EXAMPLE

a(3) = 300 as there are 300 3-digit numbers divisible by 3, 102 to 999.

CROSSREFS

Sequence in context: A264553 A278641 A219709 * A032165 A124174 A264414

Adjacent sequences:  A061769 A061770 A061771 * A061773 A061774 A061775

KEYWORD

nonn,base,easy

AUTHOR

Amarnath Murthy, May 23 2001

EXTENSIONS

More terms from Jason Earls, May 26 2001

STATUS

approved

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Last modified January 20 04:14 EST 2019. Contains 319323 sequences. (Running on oeis4.)