a(1) = 2; for n > 1 if n is even a(n) = gpf(1 + Product_{odd m,m<n}a(m)), while if n is odd a(n) = gpf(1 + Product_{even m,m<n}a(m)).
A258581
a(1) = 2; for n > 1 if n is even a(n) = gpf(1 + Product_{odd m,m<n}a(m)), while if n is odd a(n) = gpf(1 + Product_{even m,m<n}a(m)).
Terms
- a(0) =2a(1) =3a(2) =2a(3) =5a(4) =2a(5) =3a(6) =23a(7) =37a(8) =17a(9) =149a(10) =761a(11) =50647a(12) =4799a(13) =411527
External references
- oeis: A258581