Numbers k such that k and k^2 use only the digits 1, 2, 4 and 6.
A136992
Numbers k such that k and k^2 use only the digits 1, 2, 4 and 6.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =11a(4) =12a(5) =21a(6) =46a(7) =121a(8) =162a(9) =642a(10) =6642a(11) =11142a(12) =664162a(13) =66641662a(14) =6664414162
External references
- oeis: A136992