Numbers k such that k and k^2 use only the digits 1, 2, 4, 5 and 8.

Terms

a(0) =1a(1) =2a(2) =5a(3) =11a(4) =12a(5) =15a(6) =21a(7) =22a(8) =112a(9) =122a(10) =211a(11) =221a(12) =285a(13) =1122a(14) =1488a(15) =1585a(16) =2211a(17) =2285a(18) =11141a(19) =12421a(20) =12428a(21) =15888a(22) =111585a(23) =124585a(24) =145415a(25) =241285a(26) =242511a(27) =285112a(28) =285515a(29) =285521