Numbers n such that string 5,5 occurs in the base 9 representation of n but not of n-1.

Terms

a(0) =50a(1) =131a(2) =212a(3) =293a(4) =374a(5) =450a(6) =536a(7) =617a(8) =698a(9) =779a(10) =860a(11) =941a(12) =1022a(13) =1103a(14) =1179a(15) =1265a(16) =1346a(17) =1427a(18) =1508a(19) =1589a(20) =1670a(21) =1751a(22) =1832a(23) =1908a(24) =1994a(25) =2075a(26) =2156a(27) =2237a(28) =2318a(29) =2399