Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
100: | \[{4^{100}-1\over3}\] | 53 × 11 × 17 × 31 × 41 × 101 × 251 × 401 × 601 × 1801 × 4051 × 8101 × 61681 × 268501 × 340801 × 2787601 × 3173389601 |