# How to sum the log of the first n primes?

This is a very naive question, and it may not fit the etiquette of the forum.

How do you handle the fact that

`log(7)`

prints out as `log(7)`

, and only after expressing it as `log(7.0)`

do you get `1.94591014905531`

I would try and generate the sum using the function `primes_first_n(n)`

. However, `log(primes_first_n(n))`

is not a valid expression, and I don't know if it is because of the point about the logarithmic function above, or it is because log cannot be applied to a vectorial expression.