collatz_problem.ts

// https://en.wikipedia.org/wiki/Collatz_conjecture
function collatzStep(n: number): number {
    if (n % 2 === 0) {
        return n/2;    
    } else {
        return (n * 3) + 1;
    }
}

let i: number = 1;
let n: number = 3;  // number to start with

console.log(`${i}: ${n}`);
while (true) {
    n = collatzStep(n);
    console.log(`${i}: ${n}`);
    i++;
    if (n === 1) {
        break;
    }
}