Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
279: | \[{5^{279}-1\over4}\] | 19 × 312 × 829 × 1861 × 148429 × 878851 × 247114592858611<15> × 625552508473588471<18> × 172974812463239310024750410929<30> × 2619475147786243221682441564765834085031894176855868169779152514905083781606453302669371739151283560390355875491<112> |