Iterate x -> A080670(x) starting at n until reach 1 or a prime; or -1 if a prime is never reached.
1, 2, 3, 211, 5, 23, 7, 23, 2213, 2213, 11, 223, 13, 311, 1129, 233, 17, 17137, 1
4 seqfan posts
Thu Sep 15 20:50:19 CEST 2011 [seqfan] Re: Do 20 and 105 eventually reach a prime in these sequences?
Thu Sep 15 02:15:02 CEST 2011 [seqfan] Re: Do 20 and 105 eventually reach a prime in these sequences?
Wed Sep 14 19:58:47 CEST 2011 [seqfan] Re: Do 20 and 105 eventually reach a prime in these sequences?
Wed Sep 14 06:44:39 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
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