Prime Journey

Earn Journey Map milestones as you factor composites, animate Eratosthenes sieves, and spot twin primes—one linked expedition, not a single-purpose calculator. • Test primality and nth-prime lookups in Prime Explorer: twin partners, digit sums, and side-by-side comparisons up to 999,999. • Break composites in Factor Forge with expandable factor trees, copy/share breakdowns, and recent factorization history. • Run Sieve Studio with adjustable range, speed control, and highlights for twin primes and Mersenne candidates. • Train in Challenge Arena: timed Quick Fire plus Factor Hunt and Pattern Spotter modes with streaks and personal bests. • Save discoveries in Discovery Journal with notes, tags, search, and quick jumps back to Explorer or Lab. Everything runs on-device—milestone progress, quiz scores, journal JSON storage, bundled question banks, and prime tables work offline with no login or backend. Revisit famous primes, refresh expedition progress on Journey, and reset data from Settings when you want a clean run. For learners who want prime numbers to feel like a trail of badges, not a static reference table.