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M21
| M21 | |
|---|---|
| Prime class : | |
| Type : | Mersenne prime |
| Formula : | Mn = 2n - 1 |
| Prime data : | |
| Rank : | 21 |
| n-value : | 9,689 |
| Number : | 478220278805...826225754111 |
| Digits : | 2,917 |
| Perfect number : | 29,688 • (29,689-1) |
| Digits : | 5,834 |
| Discovery data : | |
| Date of Discovery : | 1963-05-11 |
| Discoverer : | Donald B. Gillies |
| Found with : | Lucas-Lehmer test / ILLIAC II |
