Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
151: | \[{15^{151}-1\over14}\] | 907 × 2417 × 7853 × 539366051533252310579<21> × 8751090774771560578063<22> × 3418115629678457088247429676637935888937605379466632928476624876709425479550019437427939675334461251974186511242206688062619<124> |