Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 679: | \[{4^{679}-1\over3}\] | 43 × 127 × 971 × 1553 × 6791 × 11447 × 31817 × 59753 × 93703 × 48372050082931<14> × 1100876018364883721<19> × 13842607235828485645766393<26> × 486136475589650253586227318540449<33> × 209263101129304381417185794914874527112788657<45> × 1337351764099536062382592381405648316666025584913912478511<58> × 74807245187680373979431829854135028893722761015843789130490928819762035110878016097<83> × 2451100733567925522527673091670682648370765084219128079350970030540433626374624088043739553614894829529<103> |