Quasi-Carmichael numbers to base -9: squarefree composites n such that prime p|n ==> p+9|n+9.

Terms

a(0) =231a(1) =2679a(2) =18471a(3) =24311a(4) =61171a(5) =71799a(6) =84271a(7) =107371a(8) =112871a(9) =140151a(10) =150071a(11) =305359a(12) =364791a(13) =420391a(14) =483351a(15) =854845a(16) =948631a(17) =966671a(18) =1003191a(19) =1209745a(20) =1260791a(21) =1327911a(22) =1451791a(23) =1675511a(24) =1691351a(25) =1870167a(26) =1982391a(27) =2400935a(28) =2721535