We have a lot of is_prime (or similar) functions: https://github.com/TheAlgorithms/Python/search?p=4&q=is_prime, https://github.com/TheAlgorithms/Python/search?q=isPrime, data_structures/hashing/number_theory/prime_numbers, etc. Shall we use one common function for that exactly identical

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Last.fm scrobbler

Trying to connect last fm scrobbler

steps i did;

1. Settings > connect last fm
2. opens in browser, press allow access,
3. asks for xdg-open cider, click xdg-open
4. button in cider says connecting for a few secs nothing happens to the allow page doesnt connect.

Steps to Reproduce

1. connect lastfm button
2. click on xdg-open in browser

Enviro

Rocksdb has a write option to set it low priority. Our pruners should use this option.

Other options that seems no brainer to enable:

1. use "multithreaded" flavor of the DB https://docs.rs/rocksdb/latest/rocksdb/type.DB.html#compatibility-and-multi-threaded-mode

2. these options upon DB open:

       let mut opts = Options::default();

        opts.increase_parallelism(num_cpus::