Numbers k such that k^2 contains only digits {4,5,7}.
A053950
Numbers k such that k^2 contains only digits {4,5,7}.
Terms
- a(0) =2a(1) =88a(2) =6888a(3) =6912a(4) =7588a(5) =68962a(6) =6674412a(7) =2749137588a(8) =7466242412
External references
- oeis: A053950