Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
268: | \[{5^{268}-1\over4}\] | 22 × 3 × 13 × 269 × 1609 × 20369 × 26399 × 2454335007529<13> × 604088623657497125653141<24> × 11293772630057337854244300009061892827351888021<47> × 8670367881621696201246383264395739338019619427601080980701370016748806481465099715917129<88> |