a(n) is the smallest k such that k*2^n + 1 is prime.

Terms

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