Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 398: | \[{4^{398}-1\over3}\] | 5 × 797 × 164504919713<12> × 76554648784441<14> × 2099073106303095025303885460879717918033130293<46> × 4884164093883941177660049098586324302977543600799<49> × 1008116715344410461444141839610180239223178503751442552629<58> × 267823007376498379256993682056860433753700498963798805883563<60> |