Base 19 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
81: | \[{19^{81}-1\over18}\] | 34 × 127 × 487 × 523 × 3727 × 29989 × 216919 × 907471 × 362063089 × 100974986546704014563516474586369230337004982214028298769888689881<66> |