a(1) = 3; for n > 1, choose a(n) to be the smallest number such that a(n) > a(n-1) and (a(n)*a(n-1)+1) mod (a(n)+a(n-1)+1) = 0.

A064457

a(1) = 3; for n > 1, choose a(n) to be the smallest number such that a(n) > a(n-1) and (a(n)*a(n-1)+1) mod (a(n)+a(n-1)+1) = 0.

Terms

    a(0) =3a(1) =7a(2) =47a(3) =157a(4) =293a(5) =1807a(6) =8697a(7) =9447a(8) =15147a(9) =31497a(10) =74847a(11) =159111a(12) =1031187a(13) =1100457a(14) =1740087a(15) =3589707a(16) =8498937a(17) =10312173a(18) =15086925a(19) =51874335a(20) =54072205a(21) =746239895a(22) =1433920655a(23) =11288282053

External references