Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 207: | \[{31^{207}-1\over30}\] | 32 × 139 × 331 × 3637 × 15733 × 81343 × 1164859 × 1509997 × 61562537 × 16798026051215317<17> × 2553526979752336381<19> × 7176374761323733117<19> × 975573640291548852951234645170717556781<39> × [273942373786692967763113736032045313497104680112523014288492428373127350772268097964864753386252739092141557671166387173976933601164996115754599118521256858426441906547479268521<177>] |