Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 146: | \[{20^{146}-1\over19}\] | 3 × 7 × 30223 × 80447 × 92419 × 8140523 × 2991402761 × 6412324721641<13> × 5080516670789273543<19> × 14951607434498798145554889626044947483088978695769<50> × 8388017164299528473137529640945135276336333707655875659563939090886233451999<76> |