Numbers n such that string 2,6 occurs in the base 10 representation of n but not of n-1.

Terms

a(0) =26a(1) =126a(2) =226a(3) =260a(4) =326a(5) =426a(6) =526a(7) =626a(8) =726a(9) =826a(10) =926a(11) =1026a(12) =1126a(13) =1226a(14) =1260a(15) =1326a(16) =1426a(17) =1526a(18) =1626a(19) =1726a(20) =1826a(21) =1926a(22) =2026a(23) =2126a(24) =2226a(25) =2260a(26) =2326a(27) =2426a(28) =2526a(29) =2600