OFFSET
1,2
EXAMPLE
a(5)=2775 because 10^4 - 2775 = 7225 = 85^2.
MATHEMATICA
Select[Accumulate[Range[110000]], IntegerQ[Sqrt[10^IntegerLength[#]-#]]&] (* Harvey P. Dale, Nov 18 2021 *)
CROSSREFS
KEYWORD
base,easy,nonn
AUTHOR
Jason Earls, Jul 24 2005
STATUS
approved