Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
287: | \[{3^{287}-1\over2}\] | 83 × 1093 × 2526913 × 86950696619<11> × 2153815505142676918154751239812514551481357236630129622919758331450476553285988116532295282822690159583410271804001<115> |