Number of n-digit primes in carryless arithmetic mod 10.

Terms

a(0) =0a(1) =0a(2) =28a(3) =44a(4) =168a(5) =612a(6) =2520a(7) =10356a(8) =44712a(9) =195120a(10) =868224a(11) =3905388a(12) =17756424a(13) =81376140a(14) =375603480a(15) =1743843924a(16) =8138028696a(17) =38146891320a(18) =179515196280a(19) =847710124128