Numbers k such that k and k^2 use only the digits 1, 2, 4 and 5.
A136987
Numbers k such that k and k^2 use only the digits 1, 2, 4 and 5.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =11a(4) =12a(5) =15a(6) =21a(7) =112a(8) =211a(9) =145415a(10) =11145511
External references
- oeis: A136987