duplicate hunting, pt. 13

Martin Fuller martin_n_fuller at btinternet.com
Thu May 10 13:06:58 CEST 2007

--- Andrew Plewe <aplewe at sbcglobal.net> wrote:
> Possible duplicates:
> A116443 and A116444
> http://www.research.att.com/~njas/sequences/?q=id:A116443|id:A116444

A116444 the values need to be changed to match the definition and
example.  [The correct values are not yet in the database.]

%I A116444
%S A116444 1, 3, 9, 11, 13, 21, 33, 39, 63, 77, 91, 99, 137, 219, 411,
657, 9091, 29703, 89109, 909091, 5882353, 10989011, 12145749, 12987013,
14354067, 20979021, 22556391, 32967033, 36437247, 38961039, 43062201,
52631579, 62937063, 67669173, 76923077, 90909091, 98901099, 297029703,
891089109, 1185770751, 2479338843, 3557312253, 4347826087, 7438016529,
%o A116444 (PARI)
for(d=1,10,fordiv(9*10^(d+1)+9,a,if(#Str(a)==d,print1(a", "))))
%O A116444 1
%K A116444 ,base,nonn,
%A A116444 Martin Fuller (martin_n_fuller at btinternet.com), May 10 2007

> A054386 and A127450
> http://www.research.att.com/~njas/sequences/?q=id:A054386|id:A127450

First difference is at A054386(122)=178, A127450(122)=179.
I'll send b-files.

Martin Fuller

Very important:  when you look up a sequence to

leave off the first couple of terms  (because people may choose
a different start)


don't enter too many terms  (if you have more than
are in the OEIS, you won't get a match unless
you use Superseeker)

It says this in the "hints".


NJAS writes that one way to reduce the number of sequence duplicates is 
to not check for too many terms when doing a search for a sequence's 
existence in the OEIS, since some sequences have only a relatively few 
number of terms in the database.

Let me take this opportunity to point out that there are almost 600 
pages(!) of sequences that have keyword:more. Having these sequences 
extended would possibly cut down on the number of dupicates too.

There are 22 pages of sequences originally submitted by me, for instance, 
that have keyword:more.
I do not possess any mathematical software, and figure my sequences' 
terms out by hand. I usually do not have confidence enough to calculate 
my sequences much past 12 or so terms.
A few EIS contributors have computed more many more terms for many of my 
of mine that need extending and possible correcting.
(There is a particular need for my sequences involving continued 
fractions to be extended/corrected.)

You never know, with frequent duplicate-sequence-submitters instead 
devoting their energies and computer software to extending "more" 

Leroy Quet

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