Numbers n such that string 1,3 occurs in the base 10 representation of n but not of n+1.

Terms

a(0) =13a(1) =113a(2) =139a(3) =213a(4) =313a(5) =413a(6) =513a(7) =613a(8) =713a(9) =813a(10) =913a(11) =1013a(12) =1113a(13) =1139a(14) =1213a(15) =1399a(16) =1413a(17) =1513a(18) =1613a(19) =1713a(20) =1813a(21) =1913a(22) =2013a(23) =2113a(24) =2139a(25) =2213a(26) =2313a(27) =2413a(28) =2513a(29) =2613