Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 177: | \[{28^{177}-1\over27}\] | 3 × 271 × 1063 × 14869 × 20597491 × 63980899 × 87134177825869551823<20> × 419930371190062133539<21> × 5022695745870832133027085305336540933925584592857099219467<58> × 9643579894368157824900039911930865360964315755820145323893317<61> × 17309980332858692671126118984647399174872318214219443080540720659690393<71> |