Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 405: | \[{28^{405}-1\over27}\] | 34 × 192 × 31 × 271 × 541 × 811 × 15991 × 444979 × 637421 × 734941 × 48403441 × 5220455384797651<16> × 91140307249283821<17> × 68948693997660959163751<23> × 1114029602365666612314868561<28> × 577400813605177748144627339431<30> × 406385801136251056203404767327746977944898798686435295642111734855861<69> × 467102764647624870534174882972667122829050205740085854715337092963516619074219<78> × 6678168587239573731912493672848217637555576161417173284967228612549397804150391065213116467650212307842952277745820432278371608621335373300535777962138964687721934163227146736997817979770650201864006853604204783376354308681349397943158794619431323999579631625786867600246916313339671<283> |