Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
237: | \[{5^{237}-1\over4}\] | 31 × 12799 × 657439 × 205367807127911<15> × 58523123221688392679<20> × 344120456368919234899<21> × 447298617719114285037649<24> × 2345686307673715163413883715539611340581195468538385022919593678861026860089<76> |