a(n)=smallest positive integer such that product{k=1 to n}(1+1/a(k)) has a prime numerator.

Terms

a(0) =1a(1) =2a(2) =6a(3) =1a(4) =28a(5) =1a(6) =1a(7) =58a(8) =1a(9) =708a(10) =1a(11) =1a(12) =2a(13) =1a(14) =2836a(15) =1a(16) =1a(17) =22696a(18) =1a(19) =1a(20) =1a(21) =590122a(22) =1a(23) =12a(24) =1a(25) =1a(26) =2a(27) =1a(28) =1180246a(29) =1