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

[f.firoozbakht at sci.ui.ac.ir]

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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