Numbers k such that k and k^2 use only the digits 1, 6, 7 and 8.
A137064
Numbers k such that k and k^2 use only the digits 1, 6, 7 and 8.
Terms
- a(0) =1a(1) =881a(2) =88776a(3) =7866881
External references
- oeis: A137064
A137064
Numbers k such that k and k^2 use only the digits 1, 6, 7 and 8.