Base 13 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
66: | \[{13^{66}-1\over12}\] | 2 × 3 × 7 × 23 × 61 × 67 × 157 × 331 × 419 × 859 × 1123 × 6997 × 18041 × 122167 × 960961 × 128011456717<12> × 17551032119981679046729<23> |