Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 275: | \[{4^{275}-1\over3}\] | 112 × 23 × 31 × 89 × 251 × 601 × 683 × 881 × 1801 × 2971 × 3191 × 4051 × 201961 × 48912491 × 382027665134363932751<21> × 4074891477354886815033308087379995347151<40> × 1657154808755021818820630633083400618861135574408955395309601<61> |