Corrected On sequence nXn where x equal 09,18,27,36,45,54,63,72,81,90

[Karima MOUSSAOUI]

Dear, 

You can accelerate your program with selecting only the number on the form (6*n-1 and 6*n+1)

Thanks


> Message du 23/02/04 18:28
> De : Meeussen Wouter (bkarnd) 
> A : bouyao at wanadoo.fr, seqfan at ext.jussieu.fr
> Copie à : 
> Objet : RE: Corrected On sequence nXn where x equal 09,18,27,36,45,54,63,72,81,90
> not within the lowest 10^5 trials:
> test = ToString@{n09n, n18n, n27n, n36n, n45n, n54n, n63n, n72n, n81n, n90n};
> 
> Select[Range[100000], 
> And @@ PrimeQ[ToExpression[StringReplace[test,
> "n" -> ToString[#]]]] &]
> returns the empty list
> {}
> 
> W.
> 
> (Please, send plaint text)
> 
> 
> 
> -----Original Message-----
> From: Karima MOUSSAOUI [mailto:bouyao at wanadoo.fr]
> Sent: maandag 23 februari 2004 18:16
> To: seqfan at ext.jussieu.fr
> Subject: Corrected On sequence nXn where x equal 09,18,27,36,45,54,63,72,81,90
> 
> 
> Dear Seqfna,
> Can anyone find n such that n09n, n18n,n27n,n36n,n45n,n54n,n63n,n72n,n81n,n90n, are all primes
> where n09n designe concatenation of (n 09 n) (example 1091 is prime, 310931 is prime)
> Thanks
> M.Bouayoun
> 
> 
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