A110804 a(1) = 10, a(n) = a(n-1) times the number of digits in a(n-1).

10, 20, 40, 80, 160, 480, 1440, 5760, 23040, 115200, 691200, 4147200, 29030400, 232243200, 2090188800, 20901888000, 229920768000, 2759049216000, 35867639808000, 502146957312000, 7532204359680000

Offset

1,1

Comments

For every n there is a least number k such that n! divides a(m) for all m > k. Subsidiary sequence: least k such that n! divides a(k).

Links

Table of n, a(n) for n=1..21.

Example

Next term after 160 is 160*3 = 480.

Mathematica

NestList[# IntegerLength[#] &, 10, 20] (* Harvey P. Dale, Feb 04 2011 *)

Crossrefs

Sequence in context: A013978 A241608 A053162 * A048063 A007927 A284991

Adjacent sequences: A110801 A110802 A110803 * A110805 A110806 A110807

Keyword

base,easy,nonn

Author

Amarnath Murthy, Aug 14 2005

Extensions

More terms from Harvey P. Dale, Feb 04 2011

Status

approved