OFFSET
1,1
COMMENTS
a(n) = 1296n^2 + n for n < 75, but a(75) = 7102298. - Charles R Greathouse IV, Aug 04 2017
LINKS
Charles R Greathouse IV, Table of n, a(n) for n = 1..10000
MATHEMATICA
cf72Q[n_]:=Module[{s=Sqrt[n]}, If[IntegerQ[s], 1, Min[ContinuedFraction[s][[2]]]]==72]; Select[Range[12*10^5], cf72Q] (* Harvey P. Dale, Jul 15 2020 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved