Numbers k such that k and k^2 use only the digits 4, 6, 7 and 8.
A137144
Numbers k such that k and k^2 use only the digits 4, 6, 7 and 8.
Terms
- a(0) =8a(1) =88a(2) =8874a(3) =68474a(4) =86478
External references
- oeis: A137144
A137144
Numbers k such that k and k^2 use only the digits 4, 6, 7 and 8.