A187823 - cp's OEIS frontend

A187823 Primes of the form (p^x - 1)/(p^y - 1), where p is prime, y > 1, and y is the largest proper divisor of x.

n	a(n)
1	5
2	17
3	73
4	257
5	757
6	65537
7	262657
8	1772893
9	4432676798593
10	48551233240513
11	378890487846991
12	3156404483062657
13	17390284913300671
14	280343912759041771
15	319913861581383373
16	487014306953858713
17	5559917315850179173
18	7824668707707203971
19	8443914727229480773
20	32564717507686012813

[5, 17, 73, 257, 757, 65537, 262657, 1772893, 4432676798593, 48551233240513, 378890487846991, 3156404483062657, 17390284913300671, 280343912759041771, 319913861581383373, 487014306953858713, 5559917315850179173, 7824668707707203971, 8443914727229480773, 32564717507686012813]

cp's OEIS Frontend

A187823 Primes of the form (p^x - 1)/(p^y - 1), where p is prime, y > 1, and y is the largest proper divisor of x.

Table of values

List of values