Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
254: | \[{5^{254}-1\over4}\] | 2 × 3 × 509 × 2287 × 2735581 × 3076137716865400512817630590222174947182195052472086065321936995866231846027<76> × 14693679385278593849609206715278070972733319459651094018859396328480215743184089660644531<89> |