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

[bouyao]

Dear Farideh,

for p11p
p=999931
for example p11p= 99993111999931 is prime
and the next is        100003031110000303
----- Original Message ----- 
From: <f.firoozbakht at sci.ui.ac.ir>
To: "Karima MOUSSAOUI" <bouyao at wanadoo.fr>
Cc: "Richard Guy" <rkg at cpsc.ucalgary.ca>; <seqfan at ext.jussieu.fr>
Sent: Saturday, February 28, 2004 2:36 PM
Subject: Re: Corrected On sequence nXn where x equal
09,18,27,36,45,54,63,72,81,90


>
> Dear Bouyao,
>
> > I remark that if p is prime , there are :
> > no prime numbers between 10^5 and 10^6 for p07p
>
> If p=11,41,53& 89  then  10^5 < p07p < 10^6 and p07p is prime.
>
> Also for 4945 prime numbers p of 68906 primes between 10^5 and
> 10^6, p07p is prime.
> (For p=100109,100361,100547,...,999611 & 999953  p07p is prime.)
>
> > no prime numbers betwen 10^6 and 10^7 for p14p
>
> There doesn't exist prime of the form  p14p  between 10^6 and 10^7
> because number of digits of every number of the form  p14p  is even
> and number of digits of each integer between 10^6 and 10^7 is odd.
>
> Also for 32677 prime numbers p of 586081 primes between 10^6 and
> 10^7, p14p is prime.
> (For p=1000033,1000651,1000723,...,9999481& 9999823  p14p is prime.)
>
> ...
> Please explain your question.
>
> Regards
>
> Farideh
>
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