Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 396: | \[{20^{396}-1\over19}\] | 33 × 7 × 13 × 23 × 37 × 67 × 89 × 127 × 199 × 307 × 397 × 401 × 421 × 661 × 859 × 4357 × 12277 × 24877 × 38149 × 69481 × 72733 × 315481 × 1297693 × 3049927 × 7930693 × 64008001 × 4450002049<10> × 44206188049<11> × 170770770413<12> × 424016563147<12> × 438235696009<12> × 6881957521693<13> × 10778947368421<14> × 14121717629581<14> × 175462044485240500219<21> × 922369047390135978639798529<27> × 46676296576275720360548386813<29> × 12992593428389191667383293584162419<35> × 445857960156220211502282409711073343103021<42> × 421600512689849572947361915512053302881029226277<48> × 1250113089825917214320490810908618794473831378005569<52> × 94086967910043574527011791878940936104727533129182157016069099668265603801456117<80> |