a(n) is the smallest integer not occurring earlier such that 2^a(1) + 2^a(2) + ... + 2^a(n) is a prime.

A259630

a(n) is the smallest integer not occurring earlier such that 2^a(1) + 2^a(2) + ... + 2^a(n) is a prime.

Terms

    a(0) =1a(1) =0a(2) =2a(3) =4a(4) =3a(5) =12a(6) =5a(7) =14a(8) =27a(9) =8a(10) =25a(11) =30a(12) =31a(13) =36a(14) =13a(15) =18a(16) =131a(17) =60a(18) =133a(19) =458a(20) =247a(21) =1040a(22) =21a(23) =618a(24) =283a(25) =300a(26) =209a(27) =6282a(28) =19107a(29) =11792

External references