Numbers k such that k and k^2 use only the digits 1, 3, 6 and 7.
A137037
Numbers k such that k and k^2 use only the digits 1, 3, 6 and 7.
Terms
- a(0) =1a(1) =6a(2) =131a(3) =11731a(4) =3336731a(5) =3371376a(6) =6113376a(7) =33336731a(8) =611361731
External references
- oeis: A137037