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| status (?) | digits | number |
| FF | 155 (show) | 2^512-1<155> = 3 · 5 · 17 · 257 · 641 · 65537 · 274177 · 6700417 · 67280421310721<14> · 1238926361552897<16> · 59649589127497217<17> · 5704689200685129054721<22> · 9346163971...21<62> |