Number of primary Carmichael numbers (A324316) less than 10^n.

Terms

a(0) =0a(1) =0a(2) =0a(3) =2a(4) =4a(5) =9a(6) =19a(7) =51a(8) =107a(9) =219a(10) =417a(11) =757a(12) =1470a(13) =2666a(14) =5040a(15) =9280a(16) =17210a(17) =32039a(18) =59762a(19) =111811a(20) =210627a(21) =397968