Exponent of least prime factor in prime factorization of 2*prime(n)-1.

Terms

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