Numbers n such that string 7,1 occurs in the base 9 representation of n but not of n-1.

Terms

a(0) =64a(1) =145a(2) =226a(3) =307a(4) =388a(5) =469a(6) =550a(7) =576a(8) =631a(9) =712a(10) =793a(11) =874a(12) =955a(13) =1036a(14) =1117a(15) =1198a(16) =1279a(17) =1305a(18) =1360a(19) =1441a(20) =1522a(21) =1603a(22) =1684a(23) =1765a(24) =1846a(25) =1927a(26) =2008a(27) =2034a(28) =2089a(29) =2170