Base 16 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 281: | \[{16^{281}-1\over15}\] | 563 × 3373 × 80929 × 3827221 × 91568909 × 5203536083<10> × 58381440973934522510444290213069<32> × 1031060347364991963691143703976548814351953<43> × 442079688503172860176607217752424068059658864615965341384647107224486419<72> × 42430753264205191544205509903443731248177379622499698300170116993673305525189<77> × 48009215293052652841860443273079338843737271906291675944391068955229998769420319<80> |