Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 221: | \[{28^{221}-1\over27}\] | 53 × 12377 × 4543753614603737<16> × 148020807352107352204781<24> × [5570989752239081144981192365429855501777259365566286512625539605344922864921925773523229760036575709330027524919573831333612778985874062838928899819184639267942428200193615883567523897090996299797329681209686980777410009224689477232826262531342157133062751166805320745450093<274>] |