A354189 - cp's OEIS frontend

A354189 Numbers k for which phi(A267099(k)) is equal to phi(k), where A267099 is fully multiplicative involution swapping the positions of 4k+1 and 4k+3 primes, and phi is Euler totient function.

n	a(n)
1	1
2	2
3	4
4	8
5	15
6	16
7	30
8	32
9	35
10	39
11	60
12	64
13	70
14	78
15	91
16	120
17	128
18	140
19	156
20	182
21	187
22	225
23	240
24	256
25	280
26	312
27	364
28	374
29	450
30	480
31	512
32	551
33	560
34	624
35	728
36	748
37	851
38	900
39	960
40	1024
41	1102
42	1120
43	1248
44	1271
45	1365
46	1456
47	1496
48	1702
49	1800
50	1920
51	2048
52	2204
53	2240
54	2279
55	2496
56	2542
57	2730
58	2747
59	2759
60	2805
61	2867
62	2912
63	2992

[1, 2, 4, 8, 15, 16, 30, 32, 35, 39, 60, 64, 70, 78, 91, 120, 128, 140, 156, 182, 187, 225, 240, 256, 280, 312, 364, 374, 450, 480, 512, 551, 560, 624, 728, 748, 851, 900, 960, 1024, 1102, 1120, 1248, 1271, 1365, 1456, 1496, 1702, 1800, 1920, 2048, 2204, 2240, 2279, 2496, 2542, 2730, 2747, 2759, 2805, 2867, 2912, 2992]

cp's OEIS Frontend

A354189 Numbers k for which phi(A267099(k)) is equal to phi(k), where A267099 is fully multiplicative involution swapping the positions of 4k+1 and 4k+3 primes, and phi is Euler totient function.

Table of values

List of values