Prime Number Generator — Free, No Upload, Browser-Based

Generate every prime number within any range up to one million using the Sieve of Eratosthenes — the fastest classical algorithm for the job. Set a lower and upper bound, and results appear instantly without sending anything to a server. Your input never leaves the browser, making this a safe choice for offline use and privacy-conscious environments.

如何使用此工具

1. 輸入下限（起始值）與上限（結束值），或選擇預設範圍。
2. 篩選演算法即時執行並列出範圍內的所有質數。
3. 點擊「全部複製」將以逗號分隔的清單複製到剪貼簿。