Numbers k such that k and k^2 use only the digits 0, 2, 6, 8 and 9.

Terms

a(0) =0a(1) =928886a(2) =9288860a(3) =92888600a(4) =896096886a(5) =909296886a(6) =928886000a(7) =990292886a(8) =996096886a(9) =8960968860a(10) =9088982886a(11) =9092968860a(12) =9288860000a(13) =9902928860a(14) =9960968860a(15) =89609688600a(16) =90889828860a(17) =90929688600a(18) =92888600000a(19) =99029288600a(20) =99609688600a(21) =896096886000a(22) =898999982886a(23) =908898288600a(24) =909296886000a(25) =928886000000