[seqfan] Re: A198161 through A198177
Harvey P. Dale
hpd1 at nyu.edu
Sat Oct 22 15:12:42 CEST 2011
Franklin's comments raise two questions: (1) should comments be
added to the sequences to state whether leading zeroes are permitted and
(2) should new sequences be added so that both versions (with and
without leading zeroes) appear for each xx and each yy?
From: seqfan-bounces at list.seqfan.eu
[mailto:seqfan-bounces at list.seqfan.eu] On Behalf Of
franktaw at netscape.net
Sent: Friday, October 21, 2011 7:31 PM
To: seqfan at list.seqfan.eu
Subject: [seqfan] Re: A198161 through A198177
There are actually two different sequences for each xx > 1: one allows
leading zeros, and the other does not. The sequences in the database
include both variants for values of xx, but others have only one or the
other, not always the same one.
I am in the process of submitting A198187: Primes from the decimal
expansion of pi, sorted first by the final digit index and then by
length. This falls into the category of "I'm surprised it wasn't
already there." (This sequence does not allow leading zeros, as this
would just duplicate those primes preceded by zeros.)
I will submit similar sequences for e, phi, and sqrt(2).
Franklin T. Adams-Watters
From: Harvey P. Dale <hpd1 at nyu.edu>
In response to Neil's comments, I have submitted the above
sequences so that now there are sequences in the OIES for "Primes from
merging of xx successive digits in the decimal expansion of yy" for all
xx=2 through 10 and for all yy = pi, e, phi (GoldenRatio), and sqrt(2).
I would be grateful for any comments that would clarify or improve these
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