Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 163: | \[{15^{163}-1\over14}\] | 653 × 465529 × 24841966255470713069080667642989956570531262733<47> × 23191056803152466255674679331490038948872130127488518656423<59> × 205769385940777085209469139274837910672284913150641679111339254257810534078727<78> |