Convergence verification of the Collatz problem
The convergence of all numbers below 1691 × 260 (≈ 270.72) has been verified. The work unit is 240 numbers. On modern GPUs, verification of one work unit takes 10 seconds on average. All source codes are available on this GitHub repository.
Progress towards verifying all numbers below 1692 × 260
Lowest incomplete: 91.1927 % (work unit 1774098241 × 240, all work units below are verified)
Lowest unassigned: 91.2576 % (work unit 1774098921 × 240, all work units below are assigned or even verified)