OFFSET
1,3
COMMENTS
After a(10), all terms are 0.
EXAMPLE
The only two-digit number is 88, whose square is 7744.
MATHEMATICA
cnt = 0; t2 = Table[x = Floor[Sqrt[10] * 10^(n-1)]; While[x < 10^n, If[Union[Last[Transpose[Tally[IntegerDigits[x^2]]]]] == {2}, cnt++]; x++]; cnt, {n, 6}]; Join[{0}, Differences[t2]]
CROSSREFS
KEYWORD
nonn,base
AUTHOR
T. D. Noe, Jun 21 2013
STATUS
approved