A048127 Becomes prime or 4 after exactly 5 iterations of f(x) = sum of prime factors of x.

62, 69, 74, 94, 106, 116, 123, 133, 169, 178, 188, 190, 201, 206, 228, 238, 244, 254, 259, 267, 286, 291, 292, 305, 321, 327, 340, 344, 365, 366, 370, 381, 387, 395, 403, 404, 408, 411, 413, 438, 444, 446, 453, 459, 465, 471, 472, 474, 482, 483, 484, 496

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.