# [seqfan] Re: n = number of divisors of 2^n -1

Leroy Quet q1qq2qqq3qqqq at yahoo.com
Wed Apr 21 20:00:20 CEST 2010

```Oh, I see. You downloaded all of the numbers-of-divisors-of-(2^k-1)'s, and did not extend my sequence. Sorry for the confusion.

Thanks,
Leroy Quet

[ ( [ ([( [ ( ([[o0Oo0Ooo0Oo(0)oO0ooO0oO0o]]) ) ] )]) ] ) ]

--- On Wed, 4/21/10, Leroy Quet <q1qq2qqq3qqqq at yahoo.com> wrote:

> From: Leroy Quet <q1qq2qqq3qqqq at yahoo.com>
> Subject: [seqfan] Re: n = number of divisors of 2^n -1
> To: "Sequence Fanatics Discussion list" <seqfan at list.seqfan.eu>
> Date: Wednesday, April 21, 2010, 5:51 PM
> I'm sorry. I don't know what you just
> did.
>
> The number of divisors of 2^12 -1 is 24, not 12. So, 12 is
> not in the list.
>
> Thanks,
> Leroy Quet
>
>
> [ ( [ ([( [ ( ([[o0Oo0Ooo0Oo(0)oO0ooO0oO0o]]) ) ] )]) ] )
> ]
>
>
> --- On Wed, 4/21/10, Richard Mathar <mathar at strw.leidenuniv.nl>
> wrote:
>
> > From: Richard Mathar <mathar at strw.leidenuniv.nl>
> > Subject: [seqfan] Re: n = number of divisors of 2^n
> -1
> > To: seqfan at seqfan.eu
> > Date: Wednesday, April 21, 2010, 5:34 PM
> >
> > lq> From: Leroy Quet <q1qq2qqq3qqqq at yahoo.com>
> > lq> To: seqfan at seqfan.eu
> > lq> Subject: [seqfan]  n = number of divisors of
> > 2^n -1
> > lq>
> > lq> I get the sequence where a positive integer n
> is
> > included if
> > lq> n = the number of divisors of 2^n - 1,
> > lq> begins:
> > lq> 1,2,4,6,8,16
> >
> >   sort -n -k 2 b046801.txt
> > which says that 12 is also in the list at n=21. Other
> > members in the list are
> >
> > 0 1 2 4 6 8 12 16 24 32 48 64 96 128 144 160 192 256
> 384
> > 512 768
> > 1024 1536 2048 3072 4096 4608 6144 8192 9216 10240
> 12288
> > 16384 24576
> > 32768 49152 65536 73728 98304 131072 147456 196608
> 262144
> > 294912
> > 393216 524288 655360 786432 etc
> >
> > but this is not necessarily a complete set, because
> the
> > bfile
> > is finite.
> >
> >
> > _______________________________________________
> >
> > Seqfan Mailing list - http://list.seqfan.eu/
> >
>
>
>
>
>
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>
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>

```