a(1)=5, a(n) is the smallest prime dividing 4*Q^2 + 1 where Q is the product of all previous terms in the sequence.
A057207
a(1)=5, a(n) is the smallest prime dividing 4*Q^2 + 1 where Q is the product of all previous terms in the sequence.
Terms
- a(0) =5a(1) =101a(2) =1020101a(3) =53a(4) =29a(6) =449a(7) =13a(8) =8693a(9) =1997a(10) =6029a(11) =61a(12) =3181837a(13) =113a(14) =181a(15) =1934689a(17) =4733a(18) =3617a(19) =41a(20) =68141a(21) =37a(22) =51473a(23) =17a(24) =821a(26) =157a(27) =9689a(28) =2357a(29) =757a(30) =149a(31) =293a(32) =5261
External references
- oeis: A057207