Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 553: | \[{5^{553}-1\over4}\] | 19531 × 604940596891<12> × 205367807127911<15> × 58523123221688392679<20> × 344120456368919234899<21> × 59899031643954572084019159023062286153951<41> × 28968435662932183628768998255997522550698169128129987245096614487574358387888965818281229629412798832256922485768905000745709196027642537838038619452414935637630061668352768952952487048586647415269860692298145083048538672024959199626963116585932586206967060616215176242724581<275> |