a(0) = 7; for n > 0, a(n) is the greatest prime factor of PP(PP(a(n-1)))*a(n-1)+2 where PP(n) is an abbreviation for PreviousPrime(n).
A082021
a(0) = 7; for n > 0, a(n) is the greatest prime factor of PP(PP(a(n-1)))*a(n-1)+2 where PP(n) is an abbreviation for PreviousPrime(n).
Terms
- a(0) =7a(1) =23a(2) =131a(3) =47a(4) =643a(5) =2459a(6) =2000807a(7) =503347241a(14) =254497141a(16) =201525986561
External references
- oeis: A082021