10,000 synthetic grayscale images composed from MNIST digits (black on white), resized to 128×128.
Each row corresponds to an integer n ∈ [0, 10,000] and includes:
image: digits tiled left→right with small rotation jitter
digits: e.g., "10000"
words: e.g., "ten thousand" (no "and")
value: integer 0..10,000
length: number of digits (1..5)
