A069958 - OEIS

A069958

(Sum of digits of n)^3 - (sum of digits^3 of n).

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 6, 18, 36, 60, 90, 126, 168, 216, 270, 0, 18, 48, 90, 144, 210, 288, 378, 480, 594, 0, 36, 90, 162, 252, 360, 486, 630, 792, 972, 0, 60, 144, 252, 384, 540, 720, 924, 1152, 1404, 0, 90, 210, 360, 540, 750, 990, 1260, 1560, 1890, 0

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,12

COMMENTS

a(n) = 0 iff n is a single-digit number or is a power of ten times a single-digit number.

LINKS

Table of n, a(n) for n=0..60.

FORMULA

a(n) = A007953(n)^3 - A055012(n). - Michel Marcus, Nov 01 2014

MATHEMATICA

f[n_] := Plus @@ IntegerDigits[n]^3 - Plus @@ (IntegerDigits[n]^3); Table[ f[n], {n, 0, 100}]

CROSSREFS