Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 418: | \[{4^{418}-1\over3}\] | 5 × 23 × 89 × 229 × 397 × 419 × 457 × 683 × 2113 × 6689 × 174763 × 524287 × 525313 × 2039731321 × 8857714771093<13> × 94803416684681<14> × 1512348937147247<16> × 149832750683283097<18> × 3066290411598855013<19> × 3410623284654639440707<22> × 27290812893120485231161<23> × 1937385241416564065603093<25> × 5346950541323960232319657<25> × 1607792018780394024095514317003<31> |