Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 207: | \[{15^{207}-1\over14}\] | 241 × 541 × 829 × 967 × 21061 × 31741 × 434956681 × 80732172121<11> × 3046462151831565769<19> × 874125097494737469067<21> × 153908199071740625749971976183<30> × 1322571104457879790843665431799529759992302582488293210311112541<64> × 151678797433364261160746552891204761097070118948177401139453837480455583<72> |