Numbers k such that string 0,6 occurs in the base 7 representation of k but not of k-1.

Terms

a(0) =55a(1) =104a(2) =153a(3) =202a(4) =251a(5) =300a(6) =349a(7) =385a(8) =398a(9) =447a(10) =496a(11) =545a(12) =594a(13) =643a(14) =692a(15) =728a(16) =741a(17) =790a(18) =839a(19) =888a(20) =937a(21) =986a(22) =1035a(23) =1071a(24) =1084a(25) =1133a(26) =1182a(27) =1231a(28) =1280a(29) =1329