Base 26 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
66: | \[{26^{66}-1\over25}\] | 34 × 7 × 19 × 23 × 31 × 37 × 67 × 16567 × 65539 × 97395563 × 639024871 × 135938684703251<15> × 447574944315334243<18> × 1249075800768926003921653<25> |