Base 19 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
57: | \[{19^{57}-1\over18}\] | 3 × 127 × 229 × 6841 × 80558460464029837<17> × 81403978301424181910737<23> × 109912203092239643840221<24> |