Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 347: | \[{3^{347}-1\over2}\] | 291481 × 1150057146229<13> × 185498348145073<15> × 328003153456707623<18> × 20912010800475074747<20> × 33844448484642846054095202148071217<35> × 126070773863607865045846093872785863698583762482520036673628517<63> |