[seqfan] Re: Why should A003001 be finite?
alois.heinz at hs-heilbronn.de
Sat Oct 10 19:37:37 CEST 2015
Am 10.10.2015 um 17:22 schrieb Felix Fröhlich:
> Hi Seqfans,
> in A003001 there is comment saying the sequence is probably finite. What
> property of n points towards that assumption? It seems to me the opposite
> is more likely to be true. In fact, isn't it possible for any composite c
> to construct a number k such that the digital product of k is c?
Try it with c=77.
There is no k such that the digital product of k is c
because there is no digit "11" in the decimal system.
A003001 is finite because you cannot avoid digit 0
long enough to get a larger persistence.
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