Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 498: | \[{21^{498}-1\over20}\] | 2 × 11 × 167 × 421 × 463 × 499 × 4483 × 10957 × 756131 × 941221 × 2829139 × 5260873 × 13351381 × 340541835197467124476215159811<30> × 41905574079441345694589359396489<32> × 59923443964076110556880753544175063<35> × 123598028795681525040744945941933185295442497<45> × 23343519976297040387448341592997138604460338237413223529466429945751726176986579124533941307079<95> × 2173860862337982045334802960179813405517672855950877829757443471177425126106588003687946234524060021486858816229195692478179105662830101522605267272020279564800119518922843<172> × [109607428210321084062836354535067529181755256057329744801264245904141588050491600593117025916848054615428972687321627705400801765656022181857864401426628743458005737710213867542821218479433863854795641<201>] |