Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
143: | \[{15^{143}-1\over14}\] | 53 × 67 × 463 × 2333 × 8537 × 157483 × 197341 × 16655159 × 3524961678490054751521<22> × 1813911686180774495600290811009246259606407211382731743638341671651483135886772227880267502752462144042478749031701<115> |