n# + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 55: | \[257\#+1\] | 34259 × 948293 × 3733159 × 335215943 × 62633748760943<14> × 6486192645863726521893797291785753514728160420630208237473285383<64> |