Numbers n such that string 2,7 occurs in the base 9 representation of n but not of n+1.

Terms

a(0) =25a(1) =106a(2) =187a(3) =233a(4) =268a(5) =349a(6) =430a(7) =511a(8) =592a(9) =673a(10) =754a(11) =835a(12) =916a(13) =962a(14) =997a(15) =1078a(16) =1159a(17) =1240a(18) =1321a(19) =1402a(20) =1483a(21) =1564a(22) =1645a(23) =1691a(24) =1726a(25) =1807a(26) =1888a(27) =1969a(28) =2105a(29) =2131