Number of 3-component Carmichael numbers C = (6M + 1)(12M + 1)(18M + 1) < 10^n.

Terms

a(0) =0a(1) =1a(2) =1a(3) =2a(4) =2a(5) =3a(6) =7a(7) =10a(8) =16a(9) =25a(10) =50a(11) =86a(12) =150a(13) =256a(14) =436a(15) =783a(16) =1435a(17) =2631a(18) =4765a(19) =8766a(20) =16320a(21) =30601a(22) =57719a(23) =109504a(24) =208822a(25) =400643a(26) =771735a(27) =1494772a(28) =2903761a(29) =5658670