# Looking for the definition of a specific group: CpC_p

I saw an exercice that asked me the following:

“Show that if GG does not have any non-trivial subgroups than there exists a prime pp such that: G≅CpG \cong C_p”

Now my problem is: I don’t know what the group CpC_p is. Our professor did not define it and I didn’t find a definition on the internet

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