Least k such that 4*n*k-1 is a prime.

Terms

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