Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 645: | \[{3^{645}-1\over2}\] | 112 × 13 × 431 × 4129 × 4561 × 59341 × 8477881 × 2199072289 × 8871459380575801<16> × 380808546861411923<18> × 14491125481091320910774351<26> × 912851565662857110894244969<27> × 13433188106347598163359915928450709921<38> × 2751196228592109040664179235751038501334842281<46> × 781053905037712555192394595228515676273221687831<48> × 1519151051322999908463754375854120052428983429609984806501<58> |