A236255 - cp's OEIS frontend

A236255 Prime numbers s for which there exist primes p, q, r such that phi(pqs)=phi(rs^3), sigma(pqs)=sigma(rs^3).

n	a(n)
1	2
2	3
3	5
4	7
5	31
6	43
7	139
8	157
9	191
10	269
11	293
12	337
13	463
14	557
15	593
16	683
17	709
18	757
19	769
20	983
21	1021
22	1567
23	1583
24	2293
25	2309
26	2689
27	2707
28	2801
29	2917
30	3319
31	3323
32	3583
33	3823
34	4271
35	5507
36	5557
37	6037
38	6043
39	6079
40	6151
41	6469
42	6779
43	6959
44	6977
45	7207
46	7963
47	8419
48	8429
49	8521
50	8627
51	8663
52	8861
53	8887
54	9677
55	9769
56	10163
57	10613
58	10847
59	11003

[2, 3, 5, 7, 31, 43, 139, 157, 191, 269, 293, 337, 463, 557, 593, 683, 709, 757, 769, 983, 1021, 1567, 1583, 2293, 2309, 2689, 2707, 2801, 2917, 3319, 3323, 3583, 3823, 4271, 5507, 5557, 6037, 6043, 6079, 6151, 6469, 6779, 6959, 6977, 7207, 7963, 8419, 8429, 8521, 8627, 8663, 8861, 8887, 9677, 9769, 10163, 10613, 10847, 11003]

cp's OEIS Frontend

A236255 Prime numbers s for which there exist primes p, q, r such that phi(pqs)=phi(rs^3), sigma(pqs)=sigma(rs^3).

Table of values

List of values