Numbers k such that k and k^2 use only the digits 1, 2, 5 and 8.
A137010
Numbers k such that k and k^2 use only the digits 1, 2, 5 and 8.
Terms
- a(0) =1a(1) =5a(2) =11a(3) =15a(4) =285a(5) =1585a(6) =2285a(7) =285515
External references
- oeis: A137010
A137010
Numbers k such that k and k^2 use only the digits 1, 2, 5 and 8.