JavaScript calculator for checking divisibility of large numbers by 19. Production-tested BigInt implementation with rate limiting and input validation.

BREAKING CHANGES (v2.0.0): The UI has been fully rewritten to use Bootstrap 5 and a modular CSS/token system. This is a breaking release: customization that targets previous DOM selectors or CSS ...

TOKYO – The humble pocket calculator may not be able to keep up with the mathematical capabilities of new technology, but it will never hallucinate. The device’s enduring reliability equates to ...