[seqfan] Re: Do 20 and 105 eventually reach a prime in these sequences?

D. S. McNeil dsm054 at gmail.com
Tue Sep 13 22:59:41 CEST 2011


> Do 20 and 105 reach a prime under this process?

FWIW I don't find any up to

20: 66 : 3419109323891020477115896140916537885982151410998909473170793231304944883538825046949845010887437337

or

105 : 65 : 3131512266972245513291282626262611938969770072299886730541414876607406495284609846758514357165159433

Factorizations to these steps filed with factordb.


Doug



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