Becomes prime or 4 after exactly 9 iterations of f(x) = sum of prime factors of x.

Terms

a(0) =4659a(1) =5294a(2) =5937a(3) =9286a(4) =10334a(5) =10843a(6) =15490a(7) =16382a(8) =17972a(9) =18201a(10) =18588a(11) =18735a(12) =19137a(13) =19984a(14) =20059a(15) =22482a(16) =23073a(17) =23806a(18) =25405a(19) =26405a(20) =26547a(21) =27622a(22) =27845a(23) =28694a(24) =28772a(25) =30062a(26) =30486a(27) =31686a(28) =32156a(29) =32313