Numbers k such that k and k^2 use only the digits 2, 5, 6 and 7.
A137110
Numbers k such that k and k^2 use only the digits 2, 5, 6 and 7.
Terms
- a(0) =5a(1) =25a(2) =26a(3) =75a(4) =76a(5) =275a(6) =525a(7) =526a(8) =725a(9) =7525a(10) =27525a(11) =72576a(12) =256266a(13) =276725a(14) =725725a(15) =276726675a(16) =756652275
External references
- oeis: A137110