Base 13 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 217: | \[{13^{217}-1\over12}\] | 311 × 1117 × 16493 × 5229043 × 436265047 × 506813917 × 8170509011431363408568150369<28> × 9366868544661223610069905544232905325671206870254655110731469530966941928934559<79> × 8740741575713096202756247019531372613369817940028173556582347651598007996234912657398693528302794793<100> |