Collatz Sequence Calculator

    Generate Collatz conjecture sequence

    Formula

    If even: n/2; If odd: 3n+1

    The Collatz conjecture: every starting number eventually reaches 1.

    Examples

    Starting at 27

    111 steps, peak of 9232.

    Frequently Asked Questions

    About Collatz Sequence

    Generate the Collatz sequence for any starting number.