This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A180157 #9 Nov 21 2013 12:50:05 %S A180157 10,12,14,16,18,21,23,25,27,29,30,32,34,36,38,41,43,45,47,49,50,52,54, %T A180157 56,58,61,63,65,67,69,70,72,74,76,78,81,83,85,87,89,90,92,94,96,98, %U A180157 100,101,103,104,106,107,109,110,112,113,115,116,118,119,121,122,124,125 %N A180157 Arithmetic mean of digits is not an integer. %C A180157 Complement of A061383; A180160(a(n)) > 0; %C A180157 A004426(a(n)) <> A004427(a(n)). %C A180157 It seems 'obvious' that a(n) ~ n; is this true? - _Charles R Greathouse IV_, Feb 06 2013 %H A180157 R. Zumkeller, <a href="/A180157/b180157.txt">Table of n, a(n) for n = 1..10000</a> %t A180157 Select[Range[200],!IntegerQ[Mean[IntegerDigits[#]]]&] (* _Harvey P. Dale_, Mar 27 2011 *) %o A180157 (PARI) is(n)=my(v=digits(n));sum(i=1,#v,v[i])%#v>0 \\ _Charles R Greathouse IV_, Feb 06 2013 %Y A180157 Cf. A007953, A055642. %K A180157 base,nonn,easy %O A180157 1,1 %A A180157 _Reinhard Zumkeller_, Aug 15 2010