Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 237: | \[{20^{237}-1\over19}\] | 421 × 26861 × 185907541 × 7731160503875069<16> × 70844815546026649<17> × 4178614725165165091<19> × 52283868973702536169<20> × 2418007220991138230401<22> × 7012116809755762514267308698568975988864311<43> × [2725175935126648823109651356248981226953235347372622530273498844828262280077600525325370601769283890857466119714190718813969065899365819703906300897433389409<157>] |