Numbers n such that string 5,2 occurs in the base 10 representation of n but not of n+1.

Terms

a(0) =52a(1) =152a(2) =252a(3) =352a(4) =452a(5) =529a(6) =552a(7) =652a(8) =752a(9) =852a(10) =952a(11) =1052a(12) =1152a(13) =1252a(14) =1352a(15) =1452a(16) =1529a(17) =1552a(18) =1652a(19) =1752a(20) =1852a(21) =1952a(22) =2052a(23) =2152a(24) =2252a(25) =2352a(26) =2452a(27) =2529a(28) =2552a(29) =2652