Numbers k such that k and k^2 use only the digits 1, 3, 6 and 9.
A137042
Numbers k such that k and k^2 use only the digits 1, 3, 6 and 9.
Terms
- a(0) =1a(1) =3a(2) =6a(3) =13a(4) =19a(5) =31a(6) =63a(7) =369a(8) =31131a(9) =969119
External references
- oeis: A137042