The whole page was created with Claude Code. These were the most significant prompts:

1. Create an animated D3 visualization of the Sieve of Eratosthenes — numbers in a grid, with composites crossed out as each prime is discovered
2. Color primes green, composites dark gray, the active prime cyan, and multiples being crossed out orange; show text labels inside each cell
3. Add play/pause, step, reset, and end controls, a time scrubber, and a speed slider
4. Show live stats: current prime, count of primes found, and completion percentage when done
5. Start grid at 1; let cols and rows be independently configurable so N = rows × cols
6. Add an "even" checkbox; when unchecked, show only odd numbers (doubling the numeric range per cell)