A053934 Numbers k such that k^2 contains only digits {2,8,9}.

3, 17, 173, 2983, 298327, 1732017, 5412290577, 9964933517, 5405829167667, 17320185602062360469701767

Offset

1,1

Links

Table of n, a(n) for n=1..10.

Patrick De Geest, Squares containing at most three distinct digits, Index entries for related sequences

Author?, Source, (txt)

Mathematica

Table[Select[Sqrt[FromDigits/@Tuples[{2, 8, 9}, n]], IntegerQ], {n, 15}]//Flatten (* The program generates the first six terms of the sequence. To generate more, increase the "n" constant but the program will take a long time to run. *) (* Harvey P. Dale, Nov 19 2023 *)

Crossrefs

Cf. A053935.

Sequence in context: A214346 A015083 A263460 * A159592 A126443 A054976

Adjacent sequences: A053931 A053932 A053933 * A053935 A053936 A053937

Keyword

nonn,base,more

Author

Patrick De Geest, Mar 15 2000

Extensions

More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 14 2005

One more term from Jon E. Schoenfield, Sep 04 2006

a(10) from Zhao Hui Du, Mar 09 2024

Status

approved