R function:
is_prime <- function(x) {
!any(x %% 2:(x-1) == 0L)
}
Examples:
is_prime(7)
## [1] TRUE
is_prime(934213)
## [1] FALSE
is_prime(934213)
## [1] FALSE
is_prime(999983)
## [1] TRUE
Python function:

The following definite integral problem was posted on stackexchange.com today.
\[\begin{equation} 1.35 \times10^-7\int e^{-0.03x}x^4dx
\tag{1}
\end{equation}\]
The version of the gamma function, a useful function for solving improper integrals, that I learned as an undergraduate physics major is
\[\begin{equation}
\int_{0}^{\infty} e^{-x}x^ndx = n!

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