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A175635
a(n) = smallest number m such that decimal expansion of m^2 has exactly (n+1) digits n.
0
0, 11, 149, 1156, 2538, 22925, 163284, 2116076, 9321378, 31622764
OFFSET
0,2
EXAMPLE
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.
CROSSREFS
Sequence in context: A296143 A217722 A261536 * A103544 A038141 A307072
KEYWORD
base,fini,full,nonn
AUTHOR
Zak Seidov, Aug 01 2010
STATUS
approved