OFFSET
1,2
COMMENTS
Includes all numbers of the form ((10^k-1)/3 + 26)^2 for k >= 3. - Andrew Howroyd, Sep 28 2024
LINKS
Zhao Hui Du, Table of n, a(n) for n = 1..44
FORMULA
a(n) = A053886(n)^2. - Andrew Howroyd, Oct 18 2024
MATHEMATICA
Table[Select[FromDigits/@Tuples[{1, 2, 8}, n], IntegerQ[Sqrt[#]]&], {n, 18}]//Flatten (* Harvey P. Dale, Jun 03 2022 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Patrick De Geest, Mar 15 2000
STATUS
approved