Numbers k such that k and k^2 use only the digits 0, 2, 6 and 7.
A136921
Numbers k such that k and k^2 use only the digits 0, 2, 6 and 7.
Terms
- a(0) =0a(1) =26a(2) =260a(3) =2600a(4) =26000a(5) =260000a(6) =2600000a(7) =26000000a(8) =260000000a(9) =2600000000a(10) =26000000000a(11) =260000000000
External references
- oeis: A136921