Numbers n such that string 4,5 occurs in the base 7 representation of n but not of n-1.

Terms

a(0) =33a(1) =82a(2) =131a(3) =180a(4) =229a(5) =231a(6) =278a(7) =327a(8) =376a(9) =425a(10) =474a(11) =523a(12) =572a(13) =574a(14) =621a(15) =670a(16) =719a(17) =768a(18) =817a(19) =866a(20) =915a(21) =917a(22) =964a(23) =1013a(24) =1062a(25) =1111a(26) =1160a(27) =1209a(28) =1258a(29) =1260