Numbers n such that string 1,5 occurs in the base 10 representation of n but not of n+1.

Terms

a(0) =15a(1) =115a(2) =159a(3) =215a(4) =315a(5) =415a(6) =515a(7) =615a(8) =715a(9) =815a(10) =915a(11) =1015a(12) =1115a(13) =1159a(14) =1215a(15) =1315a(16) =1415a(17) =1599a(18) =1615a(19) =1715a(20) =1815a(21) =1915a(22) =2015a(23) =2115a(24) =2159a(25) =2215a(26) =2315a(27) =2415a(28) =2515a(29) =2615