A110805 Sum of digits of n times number of digits of n.

1, 2, 3, 4, 5, 6, 7, 8, 9, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30

Offset

1,2

Links

Michael De Vlieger, Table of n, a(n) for n = 1..10000

Example

a(19) = 2 * (1 + 9) = 20.
a(1235) = 4 * (1 + 2 + 3 + 5) = 44.

Mathematica

Table[IntegerLength[n] * Total[IntegerDigits[n]], {n, 50}] (* Harvey P. Dale, Jul 31 2012 *)

Prog

(PARI) a(n) = sumdigits(n) * #digits(n); \\ Michel Marcus, Feb 24 2017

Crossrefs

Cf. A007953, A055642.

Sequence in context: A125959 A043269 A122481 * A356234 A284255 A284253

Adjacent sequences: A110802 A110803 A110804 * A110806 A110807 A110808

Keyword

base,easy,nonn

Author

Amarnath Murthy, Aug 14 2005

Status

approved