Numbers n with digits 2 and 6 only.

Terms

a(0) =2a(1) =6a(2) =22a(3) =26a(4) =62a(5) =66a(6) =222a(7) =226a(8) =262a(9) =266a(10) =622a(11) =626a(12) =662a(13) =666a(14) =2222a(15) =2226a(16) =2262a(17) =2266a(18) =2622a(19) =2626a(20) =2662a(21) =2666a(22) =6222a(23) =6226a(24) =6262a(25) =6266a(26) =6622a(27) =6626a(28) =6662a(29) =6666