Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 160: | \[{20^{160}-1\over19}\] | 3 × 7 × 11 × 17 × 41 × 61 × 97 × 251 × 401 × 2801 × 76001 × 148721 × 152381 × 160001 × 222361 × 1505882353 × 32018865275041<14> × 4406613081041681<16> × 6756288659793814433<19> × 176495898629033039186561<24> × 184467440737095516159718525023289344000000429496729599999999999344640000000000000001<84> |