Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
40: | \[{31^{40}-1\over30}\] | 27 × 5 × 11 × 13 × 37 × 41 × 181 × 409 × 1129 × 17351 × 21821 × 4707206941<10> × 727422334085254365392641<24> |