Number is Prime
function isPrime(num) {
for (var i = 2; i < num; i++) if (num % i == 0) return false;
return num >= 2;
}
Fibonacci Sequence
function fibonacci(num){
var a = 1, b = 0, temp;
while (num >= 0){
temp = a;
a = a + b;
b = temp;
num--;
}
return b;
}