func floyd(rows, n=1) {
    var max = Math.range_sum(1, rows)
    var widths = (max-rows .. max-1 -> map{.+n->to_s.len})
    { |r|
        say %'#{1..r -> map{|i| "%#{widths[i-1]}d" % n++}.join(" ")}'
    } << 1..rows
}

floyd(5)     # or: floyd(5, 88)
floyd(14)    # or: floyd(14, 900)