Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 117: | \[{15^{117}-1\over14}\] | 53 × 241 × 541 × 1249 × 20749 × 21061 × 157483 × 2854567 × 4640221 × 16655159 × 606451512892729597861<21> × 3022689049104598084874946135455929<34> × 119115855554252461371000291571475371867<39> |