Smallest sequence which lists the position of digits "5" in the sequence.

Terms

a(0) =2a(1) =5a(2) =6a(3) =7a(4) =55a(5) =56a(6) =60a(7) =61a(8) =62a(9) =63a(10) =64a(11) =66a(12) =67a(13) =68a(14) =69a(15) =70a(16) =71a(17) =72a(18) =73a(19) =74a(20) =76a(21) =77a(22) =78a(23) =79a(24) =80a(25) =81a(26) =82a(27) =83a(28) =84a(29) =550