Numbers k such that k and k^2 use only the digits 1, 2, 4 and 8.
A136999
Numbers k such that k and k^2 use only the digits 1, 2, 4 and 8.
Terms
- a(0) =1a(1) =2a(2) =11a(3) =12a(4) =21a(5) =22a(6) =122a(7) =221a(8) =1488a(9) =11141
External references
- oeis: A136999