Numbers k such that k and k^2 use only the digits 1, 2, 6 and 7.
A137013
Numbers k such that k and k^2 use only the digits 1, 2, 6 and 7.
Terms
- a(0) =1a(1) =11a(2) =26a(3) =276a(4) =161761
External references
- oeis: A137013
A137013
Numbers k such that k and k^2 use only the digits 1, 2, 6 and 7.