Base 6 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
173: | \[{6^{173}-1\over5}\] | 924669087985921<15> × 495043698717322221180325946047148316337<39> × 182207578264683089493858383020918811627594000501526518712612326479679426743760419<81> |