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

1,1

Comments

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

Links

Table of n, a(n) for n=1..52.

Crossrefs

Sequence in context: A095553 A024804 A025340 * A047823 A294738 A044997

Adjacent sequences: A048124 A048125 A048126 * A048128 A048129 A048130

Keyword

nonn

Author

David W. Wilson

Status

approved