Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 436: | \[{21^{436}-1\over20}\] | 22 × 11 × 13 × 17 × 5233 × 2215409632309<13> × 252649631352967<15> × 243559381356675673<18> × 12437625258656743104073625051<29> × 15547495436546185942695879543470800471<38> × 311230778906803012635032244112217936159403426704742287611438860807922580555261<78> × 1075844735830122358017703049625189977667287013021268821502115973717283800539785976074877960131456456976157869419<112> × [342120586813852919923456567838424861359009644681177600786503797615660420588494636222956989845437279516776110780552856351113256505340881902085618878695014449985073579873278807769148971679541070729933860979896818433954764055381722683405586118957294470612802163622342857213<270>] |