a(n) = LCM_{k=0..n} (2^k + 1).

A051844

a(n) = LCM_{k=0..n} (2^k + 1).

Terms

    a(0) =2a(1) =6a(2) =30a(3) =90a(4) =1530a(5) =16830a(6) =218790a(7) =9407970a(8) =2417848290a(9) =137817352530

External references