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1,2
Michael De Vlieger, Table of n, a(n) for n = 1..10000
a(19) = 2 * (1 + 9) = 20.
a(1235) = 4 * (1 + 2 + 3 + 5) = 44.
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
Cf. A007953, A055642.
Sequence in context: A125959 A043269 A122481 * A284255 A284253 A061499
Adjacent sequences: A110802 A110803 A110804 * A110806 A110807 A110808
base,easy,nonn
Amarnath Murthy, Aug 14 2005
approved