Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 107: | \[{18^{107}-1\over17}\] | 857 × 69973191647290497588630127823<29> × 540918390282121562487078958501625881<36> × 373822013358964207195535689489923040890019181336423948514739110673<66> |