Number of steps to reach a prime under "replace n by concatenation of its prime factors", when applied to n-th composite number, or -1 if no such number.
2, 1, 13, 2, 4, 1, 5, 4, 4, 1, 15, 1, 1, 2, 3, 4, 4, 1, 2, 2, 1, 5, 3, 2, 2, 1, 9, 2, 9, 6, 1, 1
3 seqfan posts
Thu Sep 15 20:50:19 CEST 2011 [seqfan] Re: Do 20 and 105 eventually reach a prime in these sequences?
Wed Sep 14 21:31:10 CEST 2011 [seqfan] Re: Do 20 and 105 eventually reach a prime in these sequences?
Wed Sep 14 06:11:24 CEST 2011 [seqfan] Re: Do 20 and 105 eventually reach a prime in these sequences?
Index of A-numbers in seqfan: by ascending order
by month
by frequency
by keyword
Links to OEIS content are included according to
The OEIS End-User License Agreement
.