Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 110: | \[{21^{110}-1\over20}\] | 2 × 5 × 112 × 23 × 881 × 2971 × 6073 × 40841 × 185641 × 10362529 × 5664205361<10> × 17513875027111<14> × 270573999780463721<18> × 8407123807237422961<19> × 54598616218616435702441<23> × 3246571517440758538481384401171<31> |