question of Turing program

[JOJO]

Calendar Event: November 25, 2015
Event type: User News

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hi, I am a new leaner of Turing program. A question take my 2 days and I am still struggling on it now. I would be appreciated if anyone can give me some idea where I can get the related information , or give an example to make me have idea on the stranger. thank you.

for example,
this program will write all the prime number between 1 and a user-unspecified number up to 1000, which mean that what ever number the user insert, this program will list that amount of prime numbers