Numbers n such that string 7,1 occurs in the base 10 representation of n but not of n-1.

Terms

a(0) =71a(1) =171a(2) =271a(3) =371a(4) =471a(5) =571a(6) =671a(7) =710a(8) =771a(9) =871a(10) =971a(11) =1071a(12) =1171a(13) =1271a(14) =1371a(15) =1471a(16) =1571a(17) =1671a(18) =1710a(19) =1771a(20) =1871a(21) =1971a(22) =2071a(23) =2171a(24) =2271a(25) =2371a(26) =2471a(27) =2571a(28) =2671a(29) =2710