primes.sh

#!/usr/bin/env bash
#
round() {
    echo $(printf %.$2f $(echo "scale=$2;(((10^$2)*$1)+0.5)/(10^$2)" | bc))
}

is_prime() {
    n="$1"
    if [[ "$n" -lt 2 ]]; then
        echo "false"
        return 0
    elif [[ "$n" -eq 2 ]]; then
        echo "true"
        return 0
    elif (( "$n" % 2 ==  0 )); then
        echo "false"
        return 0
    fi
    result=true
    search_limit=$(echo "sqrt($n)" | bc)
    for i in $(seq 3 $search_limit 2); do
        echo $i
        if (( $n % $i == 0 )); then
            result=false
            break
        fi
    done
    echo $result
}
is_prime "61"

count=1
for ((i=1; i<=200; i++)); do
    r=$(shuf -i 63235-3548569 -n 1)
    result=$(is_prime $r)
    echo "$count  |  $r   | $result"
    count=$((count + 1))
done