Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 198: | \[{4^{198}-1\over3}\] | 32 × 5 × 7 × 13 × 19 × 23 × 37 × 67 × 73 × 89 × 109 × 199 × 397 × 683 × 2113 × 5347 × 20857 × 42373 × 153649 × 235621 × 312709 × 599479 × 4327489 × 33057806959<11> × 8463901912489<13> × 15975607282273<14> × 242099935645987<15> |