A175635 a(n) = smallest number m such that decimal expansion of m^2 has exactly (n+1) digits n.
0, 11, 149, 1156, 2538, 22925, 163284, 2116076, 9321378, 31622764
Offset: 0
Examples
a(0)=0 because 0^2=0 has one 0 a(1)=1 because 11^2=121 has two 1's a(2)=149 because 149^2=22201 has three 2's a(8)=9321378 because 9321378^2=86888087818884 has nine 8's a(9)=31622764 because 31622764^2=999999202999696 has ten 9's.