# Fast modulo operation [duplicate]

Possible Duplicate:
calculating $a^b \!\mod c$

I have a number of form: $p^n + p$, where $p$ is a prime number and $n$ can be any large number, for example, say $10^{12}$.

What is the generic algorithm to compute $(p^n + p) \pmod k$, where $k$ is a huge number say $k=1000000007$.

Thanks!

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## marked as duplicate by hardmath, Ross Millikan, Noah Snyder, Chris Eagle, NorbertOct 8 '12 at 9:29

Since adding $p$ modulo $k$ is about as easy as any operation can be, perhaps the generic question is about exponentiating $p^n$ modulo $k$, a topic dealt with in previous questions. – hardmath Oct 2 '12 at 13:32
Possible duplicate: calculating $a^b$ mod $c$. Also two more times since then, Modular exponentiation? and how to calculate $f^x$ using fast binary exponentiation? – hardmath Oct 2 '12 at 15:11
The real question seems to be on $p^n$ mod k where n is large. For that, have a look at Modular Exponentiation on wikipedia.