A326393 - cp's OEIS frontend

A326393 Primes p for which sigma(p+1)/sigma(p) reaches a record value, where sigma(k) is the divisor sum function (A000203).

n	a(n)
1	2
2	3
3	5
4	11
5	23
6	47
7	59
8	167
9	179
10	239
11	359
12	719
13	839
14	1259
15	3359
16	5039
17	10079
18	35279
19	37799
20	55439
21	110879
22	166319
23	665279
24	831599
25	1081079
26	1441439
27	6320159
28	6486479
29	12972959
30	24504479
31	61261199
32	82162079
33	136936799
34	232792559
35	410810399
36	698377679
37	735134399

[2, 3, 5, 11, 23, 47, 59, 167, 179, 239, 359, 719, 839, 1259, 3359, 5039, 10079, 35279, 37799, 55439, 110879, 166319, 665279, 831599, 1081079, 1441439, 6320159, 6486479, 12972959, 24504479, 61261199, 82162079, 136936799, 232792559, 410810399, 698377679, 735134399]

cp's OEIS Frontend

A326393 Primes p for which sigma(p+1)/sigma(p) reaches a record value, where sigma(k) is the divisor sum function (A000203).

Table of values

List of values