Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 660: | \[{18^{660}-1\over17}\] | 53 × 73 × 112 × 13 × 19 × 23 × 31 × 41 × 61 × 67 × 89 × 199 × 229 × 307 × 3312 × 457 × 601 × 661 × 1321 × 2311 × 2711 × 9041 × 15101 × 15121 × 16127 × 16921 × 21341 × 25939 × 51217 × 145501 × 521401 × 536801 × 558721 × 1105501 × 1183381 × 1392733 × 2216281 × 6301307 × 11502811 × 50790191 × 62658091 × 142022651 × 192508801 × 1527087937 × 6749141521<10> × 7804804801<10> × 11630180251<11> × 55547468813<11> × 2570735949673<13> × 8941138915237<13> × 16172723046811<14> × 25158058915441<14> × 125500908706801<15> × 98871745396250641<17> × 143429494494648121<18> × 6489496006585655053<19> × 7741563936876515923<19> × 12909881728770411001<20> × 180281596523246195671<21> × 12042065697120681040605799<26> × 24079647987394646183428194161<29> × 430892998397907888091194741841<30> × 6190865663281639524678619528967191<34> × 4969929912382242483969355497060426638861<40> × 225951167273603305782176554748672304301510146440401<51> × 570729537545554892564129720608109404648678990604629422306349394628001<69> × 47365468247845343230787513369850784616741601809888135157705719726653727251<74> × 257466065448131977545082363288304567547551649101789402897644492856670820021<75> |