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 A164774 #8 Apr 11 2023 21:03:11
%S A164774 8,113,122,157,158,166,176,184,193,194,212,221,238,256,257,266,274,
%T A164774 275,283,284,292,311,3283,3314,3386,3391,3413,3458,3463,3517,3544,
%U A164774 3562,3593,3674,3683,3697,3724,3733,3737,3764,3814,3827,3836,3859,3863,3872,3917
%N A164774 Numbers n with property that average digit of n^2 is s=5.
%e A164774 8^2=64 and (6+4)/2=5
%e A164774 113^2=12769 and (1+2+7+6+9)/5=5.
%o A164774 (PARI) dsum(n)={my(s=0);while(n>9,s+=n%10;n\=10);s+n};
%o A164774 for(n=1,1e6,if(dsum(n^2)/#Str(n^2)==5,print1(n","))) \\ _Charles R Greathouse IV_, Nov 01 2009
%Y A164774 Subsequence of A164817.
%Y A164774 Average of digits of n^2 = s: A164771 (s=1), A164770 (s=2), A164782 (s=3), A164776 (s=4), A164774 (s=5), A164778 (s=6), A164773 (s=7), A164772 (s=8).
%K A164774 nonn,base
%O A164774 1,1
%A A164774 _Zak Seidov_, Aug 26 2009