If a(n-1) is not a prime, then a(n) = 2*a(n-1) + S; otherwise set S = -S and a(n) = prime(n) + S; start with a(1) = 2, S = -1.

A373808

If a(n-1) is not a prime, then a(n) = 2*a(n-1) + S; otherwise set S = -S and a(n) = prime(n) + S; start with a(1) = 2, S = -1.

Terms

    a(0) =2a(1) =4a(2) =9a(3) =19a(4) =10a(5) =19a(6) =18a(7) =37a(8) =22a(9) =43a(10) =32a(11) =65a(12) =131a(13) =42a(14) =83a(15) =54a(16) =109a(17) =60a(18) =119a(19) =237a(20) =473a(21) =945a(22) =1889a(23) =90a(24) =181a(25) =100a(26) =199a(27) =108a(28) =217a(29) =435

External references