OFFSET
1,1
LINKS
Patrick De Geest, Index to related sequences
Hisanori Mishima, Sporadic tridigital solutions
MATHEMATICA
Select[Flatten[Table[10#+9&/@FromDigits/@Tuples[{3, 8, 9}, n], {n, 0, 10}]], IntegerQ[Sqrt[#]]&] (* The program generates the first three terms of the sequence. *) (* Harvey P. Dale, Jan 28 2024 *)
CROSSREFS
KEYWORD
nonn,base,hard,more
AUTHOR
Patrick De Geest, Nov 15 2000
EXTENSIONS
a(3) corrected by Sascha Kurz, Jun 12 2021
STATUS
approved