Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 666: | \[{4^{666}-1\over3}\] | 32 × 5 × 7 × 13 × 19 × 372 × 73 × 109 × 149 × 223 × 593 × 1777 × 1999 × 3109 × 3331 × 10657 × 17539 × 169831 × 304363 × 321679 × 1238761 × 8271721 × 13441213 × 25781083 × 26295457 × 36085879 × 184481113 × 199381087 × 231769777 × 319020217 × 616318177 × 1398316729 × 4345052821<10> × 449818591141<12> × 698962539799<12> × 9853387597819<13> × 107775231312019<15> × 31031320083857011<17> × 4096460559560875111<19> × 194674402491792252193<21> × 1453030298001690873541<22> × 1270593144646505233013326197403<31> × 1236405128000120870775846228354119184397<40> × 25289878266790579936755261055167727601997001<44> |