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) = S = 1.

A373805

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) = S = 1.

Terms

    a(0) =1a(1) =3a(2) =4a(3) =7a(4) =12a(5) =25a(6) =51a(7) =103a(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