bearophile wrote: > import d.func, d.primes, d.string; > void main() { > const int N = 1_000_000_000; > putr( sum(xtakeWhile((int i){ return i < N;}, xprimes(N))) ); > } Yeah that's shorter (vertically; it's almost as long in characters), but how much lisp do you have to smoke to understand it?