Nothing
# Return the nth term in the fibonacci sequence (starting with 1)
# This is not a very efficient implementation :-)
fibonacci <- function(n) {
stopifnot(n>=1 && all.equal(n, as.integer(n)))
ifelse(n>2, fibonacci(n-1) + fibonacci(n-2), 1)
}
# Return the nth square number
square <- function(n) {
stopifnot(n>=1 && all.equal(n, as.integer(n)))
n^2
}
# Return the nth triangular number
triangular <- function(n) {
stopifnot(n>=1 && all.equal(n, as.integer(n)))
n*(n+1)/2
}
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