Base 22 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 87: | \[{22^{87}-1\over21}\] | 3 × 132 × 59 × 88987603 × 120593021 × 64052303668365610463<20> × 60536291009092703182715791630441<32> × 23631523424003997231317417084891139384426811<44> |