Base 19 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
78: | \[{19^{78}-1\over18}\] | 22 × 3 × 5 × 73 × 79 × 127 × 131 × 157 × 313 × 599 × 2341 × 29251 × 176021 × 291331 × 133338869 × 887960971 × 421451911540236097<18> × 2202409598047314333465675421<28> |