Number of primes p with 2^n < p < 3^n.

Terms

a(0) =0a(1) =2a(2) =5a(3) =16a(4) =42a(5) =111a(6) =296a(7) =793a(8) =2130a(9) =5796a(10) =15788a(11) =43370a(12) =119711a(13) =332449a(14) =927748a(15) =2600623a(16) =7319908a(17) =20677806a(18) =58604898a(19) =166595953a(20) =474868192a(21) =1356904893a(22) =3885983995a(23) =11151740822a(24) =32062866197a(25) =92345080709a(26) =266390632933