Comment by cbarrick

Same algorithm in Rust finds 2172315626468283465 in about 3 seconds on my M1 Pro.

    $ time cargo run --release
        Finished `release` profile [optimized] target(s) in 0.02s
         Running `target/release/p45`
    0
    1
    40755
    1533776805
    57722156241751
    2172315626468283465
    cargo run --release  2.95s user 0.04s system 98% cpu 3.029 total

Runs on the Rust Playground too: https://play.rust-lang.org/?version=stable&mode=release&edit...