Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 615: | \[2^{615}-1\] | 7 × 31 × 151 × 1231 × 13367 × 49201 × 2940521 × 3887047 × 164511353 × 70171342151<11> × 92757531554705041<17> × 177722253954175633<18> × 3427007094604641668368081<25> × 3655725065508797181674078959681<31> × 188089893911024068187126343999359519615500901401<48> |