Numbers k such that string 0,5 occurs in the base 7 representation of k but not of k-1.

Terms

a(0) =54a(1) =103a(2) =152a(3) =201a(4) =250a(5) =299a(6) =348a(7) =378a(8) =397a(9) =446a(10) =495a(11) =544a(12) =593a(13) =642a(14) =691a(15) =721a(16) =740a(17) =789a(18) =838a(19) =887a(20) =936a(21) =985a(22) =1034a(23) =1064a(24) =1083a(25) =1132a(26) =1181a(27) =1230a(28) =1279a(29) =1328