Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
151: | \[{28^{151}-1\over27}\] | 2417 × 6947 × 61609 × 12392588423<11> × 26991035025461754006311<23> × 3921876525626984750820893612423<31> × 916826970770008164675732506398062574305085212335904122771671<60> × 9876839519956185234801620942382261247690911400133437565206930473761990572427219447<82> |