a(0) = 3; for n > 0, a(n) is the greatest prime factor of PreviousPrime(a(n-1))*a(n-1)-1 where PreviousPrime(prime(k))=prime(k-1).

A031441

a(0) = 3; for n > 0, a(n) is the greatest prime factor of PreviousPrime(a(n-1))*a(n-1)-1 where PreviousPrime(prime(k))=prime(k-1).

Terms

    a(0) =3a(1) =5a(2) =7a(3) =17a(4) =11a(5) =19a(6) =23a(7) =109a(8) =17a(9) =11a(10) =19a(11) =23a(12) =109a(13) =17a(14) =11a(15) =19a(16) =23a(17) =109a(18) =17a(19) =11a(20) =19a(21) =23a(22) =109a(23) =17a(24) =11a(25) =19a(26) =23a(27) =109a(28) =17a(29) =11

External references