Exponent of 2 in prime factorization of prime(n)+3.

Terms

a(0) =0a(1) =1a(2) =3a(3) =1a(4) =1a(5) =4a(6) =2a(7) =1a(8) =1a(9) =5a(10) =1a(11) =3a(12) =2a(13) =1a(14) =1a(15) =3a(16) =1a(17) =6a(18) =1a(19) =1a(20) =2a(21) =1a(22) =1a(23) =2a(24) =2a(25) =3a(26) =1a(27) =1a(28) =4a(29) =2