Base 8 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 248: | \[{8^{248}-1\over7}\] | 32 × 5 × 13 × 17 × 241 × 373 × 1489 × 5581 × 8681 × 29761 × 49477 × 290657 × 384773 × 529510939 × 715827883 × 2147483647 × 2903110321 × 3770202641 × 951088215727633<15> × 22415398357688737<17> × 658812288653553079<18> × 4611545283086450689<19> × 1141629180401976895873<22> × 1889440425670100451996180195442651130966948029537<49> |