Number of primes < 10^n whose digits are all odd.

Terms

a(0) =3a(1) =15a(2) =57a(3) =182a(4) =790a(5) =3217a(6) =13298a(7) =56866a(8) =254689a(9) =1128121a(10) =5106701a(11) =23266331a(12) =107019385a(13) =494689488a(14) =2306491761a(15) =10758057302a(16) =50548874979