Numbers k such that string 3,5 occurs in the base 7 representation of k but not of k-1.

Terms

a(0) =26a(1) =75a(2) =124a(3) =173a(4) =182a(5) =222a(6) =271a(7) =320a(8) =369a(9) =418a(10) =467a(11) =516a(12) =525a(13) =565a(14) =614a(15) =663a(16) =712a(17) =761a(18) =810a(19) =859a(20) =868a(21) =908a(22) =957a(23) =1006a(24) =1055a(25) =1104a(26) =1153a(27) =1202a(28) =1211a(29) =1251