Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 300: | \[{21^{300}-1\over20}\] | 22 × 52 × 11 × 13 × 17 × 31 × 41 × 61 × 101 × 151 × 211 × 421 × 463 × 1051 × 1801 × 2551 × 3181 × 9391 × 18181 × 19501 × 40841 × 56501 × 185641 × 386851 × 501001 × 1191301 × 1360861 × 2031851 × 11093851 × 263977951 × 920421641 × 9728219701<10> × 201307465501<12> × 33360993558601<14> × 895322420811001<15> × 1053606939618901<16> × 248303068144516751<18> × 27385718497004633851<20> × 216079934487583829701<21> × 21990762305034205478701<23> × 138288178346489520230701<24> × 846605446315436611973101<24> × 2105812970476039816410905651801<31> × 1058442691605319849373304829336589202399592256765136233101<58> |