A110803 n times the number of digits in the decimal expansion of n.

1, 2, 3, 4, 5, 6, 7, 8, 9, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 78, 80, 82, 84, 86, 88, 90, 92, 94, 96, 98, 100, 102, 104, 106, 108, 110, 112, 114, 116, 118, 120, 122, 124, 126, 128

Offset

1,2

Links

Indranil Ghosh, Table of n, a(n) for n = 1..10000

Formula

a(n) = n * A055642(n). - Indranil Ghosh, Jan 11 2017

Example

a(1234) = 4936 = 1234*4.

Mathematica

# IntegerLength[#]&/@Range[60]  (* Harvey P. Dale, Mar 04 2011 *)

Prog

(Python)
def A110803(n):
     return n*len(str(n)) # Indranil Ghosh, Jan 11 2017

Crossrefs

Cf. A055642.

Sequence in context: A247803 A362093 A052383 * A109795 A248500 A250041

Adjacent sequences: A110800 A110801 A110802 * A110804 A110805 A110806

Keyword

base,easy,nonn

Author

Amarnath Murthy, Aug 14 2005

Extensions

Corrected by T. D. Noe, Oct 25 2006

Status

approved