Numbers k such that k and k^2 use only the digits 2, 6, 7 and 9.
A137119
Numbers k such that k and k^2 use only the digits 2, 6, 7 and 9.
Terms
- a(0) =26a(1) =27a(2) =277a(3) =269777
External references
- oeis: A137119
A137119
Numbers k such that k and k^2 use only the digits 2, 6, 7 and 9.