Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 127: | \[{4^{127}-1\over3}\] | 56713727820156410577229101238628035243<38> × 170141183460469231731687303715884105727<39> |
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 127: | \[{4^{127}-1\over3}\] | 56713727820156410577229101238628035243<38> × 170141183460469231731687303715884105727<39> |