Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 227: | \[{3^{227}-1\over2}\] | 19907051929<11> × 86695423725589885803695742296342497463<38> × 586802158643368690388409871761484798763798234696414454735059<60> |