OFFSET
1,1
COMMENTS
Not the same as P(n) = 89*n^2 + 2848*n + 22784: P(n) = a(n) for a < 37, but a(37) = 3698225. - Charles R Greathouse IV, Jul 28 2010
EXAMPLE
25721_102884 = 160378^2.
MATHEMATICA
Select[Range[250000], IntegerQ[Sqrt[#*10^IntegerLength[4*#]+4*#]]&] (* Harvey P. Dale, Jan 04 2019 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, Jan 25 2006
STATUS
approved