Becomes prime after exactly 10 iterations of f(x) = sum of prime factors of x.

Terms

a(0) =167073a(1) =212438a(2) =424876a(3) =480226a(4) =492494a(5) =501219a(6) =567614a(7) =595942a(8) =656714a(9) =668319a(10) =670465a(11) =688958a(12) =723853a(13) =738662a(14) =743973a(15) =768817a(16) =791842a(17) =804558a(18) =849752a(19) =849818a(20) =864074a(21) =887613a(22) =888542a(23) =960452a(24) =975662a(25) =984988a(26) =1012786a(27) =1037845a(28) =1048574