Number of n-digit primes in A104179.

Terms

a(0) =4a(1) =4a(2) =8a(3) =10a(4) =17a(5) =24a(6) =46a(7) =94a(8) =139a(9) =241a(10) =416a(11) =688a(12) =1170a(13) =1969a(14) =3345a(15) =5674a(16) =9527a(17) =16316a(18) =27464a(19) =46668a(20) =78897a(21) =134097a(22) =226457a(23) =381906a(24) =645210a(25) =1093472a(26) =1843869a(27) =3127129a(28) =5278196