Least number which becomes prime after exactly n iterations of f(x) = sum of prime factors of x.
A047830
Least number which becomes prime after exactly n iterations of f(x) = sum of prime factors of x.
Terms
- a(0) =2a(1) =4a(2) =14a(3) =26a(4) =62a(5) =134a(6) =393a(7) =1774a(8) =13682a(9) =41037a(10) =167073a(11) =334142a(12) =4677862a(13) =14033577a(14) =79464886a(15) =476789307a(16) =3488435822a(17) =34884358195
External references
- oeis: A047830