Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 280: | \[{5^{280}-1\over4}\] | 23 × 3 × 11 × 13 × 29 × 41 × 71 × 211 × 241 × 281 × 313 × 449 × 521 × 631 × 4201 × 9161 × 19531 × 15216601 × 85280581 × 234750601 × 632133361 × 4698932281<10> × 59509429687890001<17> × 514845603025661988644048801<27> × 13148832195720299503896018648521<32> × 24554874798220986864643786538129965751201<41> |