Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
90: | \[{28^{90}-1\over27}\] | 32 × 11 × 192 × 29 × 31 × 37 × 127 × 271 × 757 × 1801 × 3061 × 3511 × 4621 × 15991 × 53951 × 102547 × 444979 × 637421 × 691651 × 734941 × 7302331 × 48403441 × 84673681 × 551640495331<12> × 1114029602365666612314868561<28> |