Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 260: | \[{18^{260}-1\over17}\] | 53 × 11 × 132 × 19 × 41 × 53 × 79 × 131 × 521 × 911 × 2081 × 2711 × 3121 × 9041 × 15101 × 21997 × 145501 × 2570316451 × 4020180841 × 5601346141<10> × 29759719289<11> × 1468823240041<13> × 15715445027621<14> × 3242950762090314211<19> × 19550753008230882123401<23> × 260674349667764744544365521<27> × 72667528832748478581880458571<29> × 7122627224638909118690351246321<31> × 127359418819403064186024966593282777801<39> × 879700315136497888790604032685396769778557686061<48> |