Numbers k such that the string 4,4 occurs in the base 9 representation of k but not of k-1.

Terms

a(0) =40a(1) =121a(2) =202a(3) =283a(4) =360a(5) =445a(6) =526a(7) =607a(8) =688a(9) =769a(10) =850a(11) =931a(12) =1012a(13) =1089a(14) =1174a(15) =1255a(16) =1336a(17) =1417a(18) =1498a(19) =1579a(20) =1660a(21) =1741a(22) =1818a(23) =1903a(24) =1984a(25) =2065a(26) =2146a(27) =2227a(28) =2308a(29) =2389