a(0) = 5; for n > 0, a(n) is the greatest prime factor of PP(a(n-1))*a(n-1)-2 where PP(n) is an abbreviation for PreviousPrime(n).

A082132

a(0) = 5; for n > 0, a(n) is the greatest prime factor of PP(a(n-1))*a(n-1)-2 where PP(n) is an abbreviation for PreviousPrime(n).

Terms

    a(0) =5a(1) =13a(2) =47a(3) =673a(4) =1093a(5) =4789a(6) =15887a(7) =6961a(8) =7079a(9) =1853387a(10) =5636791a(11) =16319158451a(12) =46975091221a(13) =97536826417

External references