Sequence of non-squares

func nonsqr(n) { 0.5 + n.sqrt -> floor + n }
{|i| nonsqr(i) }.map(1..22).join(' ').say

{ |i|
  if (nonsqr(i).is_sqr) {
     die "Found a square in the sequence: #{i}"
  }
} << 1..1e6