a(0)=1; for n>0, a(n) = a(n-1) S prime(n), where S is + if n is odd and a(n-1) is even, x if n is odd and a(n-1) is odd, - if n is even and a(n-1) is even, + if n is even and a(n-1) is odd.

A109738

a(0)=1; for n>0, a(n) = a(n-1) S prime(n), where S is + if n is odd and a(n-1) is even, x if n is odd and a(n-1) is odd, - if n is even and a(n-1) is even, + if n is even and a(n-1) is odd.

Terms

    a(0) =1a(1) =2a(2) =-1a(3) =-5a(4) =2a(5) =13a(6) =26a(7) =43a(8) =62a(9) =85a(10) =114a(11) =145a(12) =182a(13) =223a(14) =266a(15) =313a(16) =366a(17) =425a(18) =486a(19) =553a(20) =624a(21) =697a(22) =776a(23) =859a(24) =948a(25) =1045a(26) =1146a(27) =1249a(28) =1356a(29) =1465

External references