Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 117: | \[{18^{117}-1\over17}\] | 73 × 79 × 521 × 937 × 991 × 6553 × 27847 × 34327 × 7424759473<10> × 29759719289<11> × 1993017556871641<16> × 170258429679493134487<21> × 7035278398590069608527<22> × 999528789074985233712133564470395480495929<42> |