Numbers n such that string 3,1 occurs in the base 8 representation of n but not of n-1.

Terms

a(0) =25a(1) =89a(2) =153a(3) =200a(4) =217a(5) =281a(6) =345a(7) =409a(8) =473a(9) =537a(10) =601a(11) =665a(12) =712a(13) =729a(14) =793a(15) =857a(16) =921a(17) =985a(18) =1049a(19) =1113a(20) =1177a(21) =1224a(22) =1241a(23) =1305a(24) =1369a(25) =1433a(26) =1497a(27) =1561a(28) =1600a(29) =1689