Question

I'm studying summation. Everything I know so far is that:
∑ni=1 i=n(n+1)2
∑ni=1 i2=n(n+1)(2n+1)6
∑ni=1 i3=n2(n+1)24
Unfortunately, I can't find neither on my book nor on the internet what the result of:
∑ni=1logi.
∑ni=1lni.
is.
Can you help me out?