Base 19 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
131: | \[{19^{131}-1\over18}\] | 1049 × 100484262131459<15> × 299402873808557<15> × 578521787170375723397796428813161563746388908361847989001658233792132225199760727224481916196442859409303368239771341723218131777413523<135> |