Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 262: | \[{20^{262}-1\over19}\] | 3 × 7 × 263 × 787 × 3407 × 8123 × 28559 × 951061 × 42826820062834429<17> × 87138888519025909<17> × 7828769974104026860693944259<28> × 3659051553554988252417553970573065937057209<43> × 17358908895752663637684695959931846281734452761<47> × 989211218764465041890284072238784671227769462489155618721<57> × 650300620130604591676227164590950525150398363049588800975488512752410100281434282247781245383853182329516809<108> |