OFFSET
1,2
LINKS
Andrew Howroyd, Table of n, a(n) for n = 1..27
FORMULA
a(n) = A053908(n)^2. - Andrew Howroyd, Oct 18 2024
MATHEMATICA
Flatten[Table[Select[FromDigits/@Tuples[{1, 6, 8}, {n}], IntegerQ[Sqrt[#]]&], {n, 10}]] (* Harvey P. Dale, Apr 22 2011 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Patrick De Geest, Mar 15 2000
EXTENSIONS
a(18) onwards using A053908 added by Andrew Howroyd, Oct 18 2024
STATUS
approved