primes less than n and relatively prime to n

[Artur]

Dear Joshua.
Procedure wasn't myself.
Go in Mathematica Help check Complement later Further Examples and see  
last expample.
ARTUR

Dnia 19-01-2007 o 20:52:30 Joshua Zucker <joshua.zucker at gmail.com>  
napisał(a):

> On 1/19/07, Artur <grafix at csl.pl> wrote:
>> 3 another definition of sequences look that same sequences. Any comment  
>> ?
>> ARTUR
>>
>> A045572 Odd but not divisible by 5.
>
> This sequence is infinite.
>
>> A085820 Possible two-digit endings of primes (with leading zeros).
>
> This is a finite sequence which contains the first few terms of A045572.
>
>> A...... primes less than n and relatively prime to n
>> {3, 7, 9, 11, 13, 17, 19, 21, 23, 27, 29, 31, 33, 37, 39, 41, 43, 47,  
>> 49,
>> 51,
>> 53, 57, 59, 61, 63, 67, 69, 71, 73, 77, 79, 81, 83, 87, 89, 91, 93, 97,  
>> 99}
>
> I don't speak Mathematica but this looks a little weird.  There
> certainly aren't 3 primes less than 1 and relatively prime to 1.  So
> please clarify the definition for me, or explain what the Mathematica
> code is doing?
>
> Thanks,
> --Joshua