Numbers n such that string 7,6 occurs in the base 10 representation of n but not of n+1.

Terms

a(0) =76a(1) =176a(2) =276a(3) =376a(4) =476a(5) =576a(6) =676a(7) =769a(8) =776a(9) =876a(10) =976a(11) =1076a(12) =1176a(13) =1276a(14) =1376a(15) =1476a(16) =1576a(17) =1676a(18) =1769a(19) =1776a(20) =1876a(21) =1976a(22) =2076a(23) =2176a(24) =2276a(25) =2376a(26) =2476a(27) =2576a(28) =2676a(29) =2769