Number of seven-prime Carmichael numbers less than 10^n.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =0a(8) =0a(9) =0a(10) =2a(11) =41a(12) =262a(13) =1340a(14) =5359a(15) =19210a(16) =60150a(17) =172234a(18) =460553a(19) =1159167a(20) =2774702a(21) =6363475a(22) =14056367a(23) =30038569a(24) =62338997