Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 205: | \[{5^{205}-1\over4}\] | 11 × 71 × 15991 × 2238236249 × 1256950067521<13> × 5079304643216687969<19> × 9353066485119999732284835819085027408231<40> × 29126077906797054524253118878873401242767428008603378081<56> |