[seqfan] Re: subset (base) of A167676: emirps which are concatenations of three consecutive primes
Maximilian Hasler
maximilian.hasler at gmail.com
Tue Nov 10 22:41:45 CET 2009
A167676 Primes P(n) that are concatenations of three consecutive
primes.
5711, 111317, 313741, 414347,
should be deleted and/or marked as erroneous version of
A030469 Primes which are concatenations of three consecutive primes.
5711, 111317, 171923, 313741, 414347,
since it is missing the 3rd term.
%o A030469 (PARI)
for(i=1,999, isprime(p=eval(Str(prime(i),prime(i+1),prime(i+2)) & print1(p", "))
Maximilian
On Tue, Nov 10, 2009 at 5:04 PM, Michael Porter <ic_designer at verizon.net> wrote:
>
> Do you know of any others? If there are others, you could make a sequence out of it. I think the site asks for a minimum of 4 terms.
>
> If you can't find any others, maybe it could go into Prime Curios:
> http://primes.utm.edu/curios
>
> I wouldn't describe it as "less interesting" at all.
>
> I noticed that A030469 and A167676 have almost exactly the same description, but one term, 171923, is in one but not the other.
>
> - Michael
>
> --- On Tue, 11/10/09, Jonathan Post <jvospost3 at gmail.com> wrote:
>
> From: Jonathan Post <jvospost3 at gmail.com>
> Subject: [seqfan] subset (base) of A167676: emirps which are concatenations of three consecutive primes
> To: "Sequence Fanatics Discussion list" <seqfan at list.seqfan.eu>
> Date: Tuesday, November 10, 2009, 12:03 PM
>
> Probably "less" interesting as OEIS goes, but I've checked that
> 353359367 is the smallest emirp which is a concatenation of three
> consecutive primes.
> Reverse A167676(12) = R(353 concat 359 concat 367) = R(353359367) =
> 763953353 is prime.
>
> That is: A167676 INTERSECTION A006567.
>
>
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