Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 405: | \[{4^{405}-1\over3}\] | 34 × 7 × 11 × 19 × 31 × 73 × 151 × 163 × 271 × 331 × 631 × 811 × 2593 × 6481 × 9721 × 15121 × 23311 × 71119 × 87211 × 135433 × 262657 × 348031 × 537841 × 18837001 × 74967931 × 97685839 × 272010961 × 2437880491 × 448217524891<12> × 10360573664851<14> × 49971617830801<14> × 385838642647891<15> × 1969543281137041<16> × 11096527935003481<17> × 17645665556213400107370602081155737281406841<44> |