Number of n-digit cuban primes.

Terms

a(0) =1a(1) =3a(2) =7a(3) =17a(4) =36a(5) =109a(6) =265a(7) =762a(8) =2125a(9) =5964a(10) =17205a(11) =49989a(12) =145047a(13) =424155a(14) =1250298a(15) =3697457a(16) =10985390a(17) =32768938a(18) =98054446a(19) =294239322a(20) =885300000a(21) =2669959359a(22) =8069333311a(23) =24435519147