Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 225: | \[{4^{225}-1\over3}\] | 32 × 7 × 11 × 19 × 31 × 73 × 151 × 251 × 331 × 601 × 631 × 1801 × 4051 × 23311 × 100801 × 115201 × 617401 × 10567201 × 18837001 × 1348206751 × 4714696801<10> × 1133836730401<13> × 13861369826299351<17> × 281941472953710177758647201<27> |