Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
45: | \[{20^{45}-1\over19}\] | 11 × 31 × 61 × 251 × 421 × 3001 × 53101 × 261451 × 64008001 × 79083953101<11> × 3994611390415801<16> |