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Arithmetic mean of digits is not an integer.
3

%I #9 Nov 21 2013 12:50:05

%S 10,12,14,16,18,21,23,25,27,29,30,32,34,36,38,41,43,45,47,49,50,52,54,

%T 56,58,61,63,65,67,69,70,72,74,76,78,81,83,85,87,89,90,92,94,96,98,

%U 100,101,103,104,106,107,109,110,112,113,115,116,118,119,121,122,124,125

%N Arithmetic mean of digits is not an integer.

%C Complement of A061383; A180160(a(n)) > 0;

%C A004426(a(n)) <> A004427(a(n)).

%C It seems 'obvious' that a(n) ~ n; is this true? - _Charles R Greathouse IV_, Feb 06 2013

%H R. Zumkeller, <a href="/A180157/b180157.txt">Table of n, a(n) for n = 1..10000</a>

%t Select[Range[200],!IntegerQ[Mean[IntegerDigits[#]]]&] (* _Harvey P. Dale_, Mar 27 2011 *)

%o (PARI) is(n)=my(v=digits(n));sum(i=1,#v,v[i])%#v>0 \\ _Charles R Greathouse IV_, Feb 06 2013

%Y Cf. A007953, A055642.

%K base,nonn,easy

%O 1,1

%A _Reinhard Zumkeller_, Aug 15 2010