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(Sum of digits of n)^5 - (sum of digits of n^5).
0

%I #5 Mar 30 2012 17:30:43

%S 0,0,27,234,1017,3114,7749,16785,32742,59022,0,18,216,999,3096,7740,

%T 16776,32733,59004,99963,27,225,999,3096,7740,16767,32733,59013,99972,

%U 161028,234,990,3096,7740,16776,32733,59013,99954,161010,248796,1017

%N (Sum of digits of n)^5 - (sum of digits of n^5).

%C a(n) = 0 iff n is a power of ten.

%t f[n_] := Plus @@ IntegerDigits[n]^5 - Plus @@ (IntegerDigits[n^5]); Table[ f[n], {n, 0, 100}]

%K base,easy,nonn

%O 0,3

%A _N. J. A. Sloane_ and _Robert G. Wilson v_, May 04 2002