Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
105: | \[{4^{105}-1\over3}\] | 3 × 72 × 11 × 31 × 43 × 71 × 127 × 151 × 211 × 281 × 331 × 337 × 5419 × 29191 × 86171 × 106681 × 122921 × 152041 × 664441 × 1564921 |