Numbers n such that string 3,3 occurs in the base 7 representation of n but not of n-1.

Terms

a(0) =24a(1) =73a(2) =122a(3) =168a(4) =220a(5) =269a(6) =318a(7) =367a(8) =416a(9) =465a(10) =511a(11) =563a(12) =612a(13) =661a(14) =710a(15) =759a(16) =808a(17) =854a(18) =906a(19) =955a(20) =1004a(21) =1053a(22) =1102a(23) =1151a(24) =1176a(25) =1249a(26) =1298a(27) =1347a(28) =1396a(29) =1445