Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 385: | \[{4^{385}-1\over3}\] | 112 × 23 × 31 × 43 × 71 × 89 × 127 × 281 × 617 × 683 × 881 × 2971 × 3191 × 55441 × 78233 × 86171 × 122921 × 201961 × 48912491 × 219980531 × 35532364099<11> × 1971764055031<13> × 581283643249112959<18> × 4362989211422861340320935785851<31> × 1276130308645500829341614664372811<34> × 31055341681190444478126719755965134571151473925765532041<56> |