[seqfan] Re: A139442

Charles Greathouse charles.greathouse at case.edu
Thu Jun 13 23:43:18 CEST 2013


Under the usual OEIS definition of prime, neither 1 nor 2 should be
included.

Charles Greathouse
Analyst/Programmer
Case Western Reserve University


On Thu, Jun 13, 2013 at 5:40 PM, T. D. Noe <noe at sspectra.com> wrote:

> 1 - 8 = -7 which is not a prime. So please do not add 1.
>
> Tony
>
>
> At 4:32 PM -0500 6/13/13, Ray Chandler wrote:
> >> -----Original Message-----
> >>
> >>      I get quite different terms for the above sequence.  My terms agree
> >> with the first three terms; then I find an additional term not now in
> the
> >> sequence; thereafter, my terms are almost (but not quite) always one
> >> greater than the terms in the sequence currently.  It seems to me to be
> >> primarily an index disagreement.
> >>
> >>      Here is my Mma program:
> >>
> >>
> With[{pms=FoldList[Times,1,Prime[Range[500]]]},Flatten[Position[pms,_?(Pr
> >> imeQ[#/2-8]&)]]]
> >>
> >>      If the program and the sequence terms could be checked, I'll be
> glad
> >> to update the sequence accordingly.
> >>
> >
> >
> >I believe Artur's sequence is correct except it should have 1 prepended.
>  I
> >would correct his code by starting with a={1}.
> >
> >Your numbers are off by one index since the pms list starts with 1.
> >Ray
> >
> >
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> >
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>
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