Numbers whose base-5 representation has the same nonzero number of 1's and 2's.

Terms

a(0) =7a(1) =11a(2) =27a(3) =35a(4) =38a(5) =39a(6) =42a(7) =47a(8) =51a(9) =55a(10) =58a(11) =59a(12) =66a(13) =71a(14) =82a(15) =86a(16) =107a(17) =111a(18) =127a(19) =135a(20) =138a(21) =139a(22) =142a(23) =147a(24) =162a(25) =175a(26) =178a(27) =179a(28) =182a(29) =186