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

Author

Amarnath Murthy, Aug 14 2005

Keywords

• base
• easy
• nonn

Examples

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

Links

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

Crossrefs

Cf. A007953, A055642.

Programs

Mathematica

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

PARI

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