Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 261: | \[{18^{261}-1\over17}\] | 73 × 991 × 1567 × 25057 × 34327 × 38281 × 1505548068007783<16> × 12621590891563680487<20> × 98800490511312118297<20> × 20423794322970766662747461449<29> × 23844678628322370113260816873780684279<38> × [15509372072464979972788872301929418704006840924713764138124583686290141386253808598299093352804150154074400098886487625218274988361573617595573959761183297649996630877090507366978354017<185>] |