A048132 Becomes prime or 4 after exactly 10 iterations of f(x) = sum of prime factors of x.

9314, 27849, 30993, 36398, 46142, 46405, 55686, 68653, 69765, 74416, 74924, 83718, 84934, 86662, 86696, 90177, 92915, 97533, 97629, 99895, 101823, 106538, 111498, 116182, 116225, 119005, 119618, 119874, 122506, 124414, 124467, 129236

Offset: 1

Author

David W. Wilson

Keywords

• nonn

Comments

f(x) = sum of prime factors with multiplicity, so that f(1500) = 2+2+3+5+5+5 = 22.