A354102 - cp's OEIS frontend

A354102 a(n) = phi(A267099(n)), 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	1
3	4
4	2
5	2
6	4
7	12
8	4
9	20
10	2
11	16
12	8
13	6
14	12
15	8
16	8
17	10
18	20
19	28
20	4
21	48
22	16
23	36
24	16
25	6
26	6
27	100
28	24
29	18
30	8
31	40
32	16
33	64
34	10
35	24
36	40
37	22
38	28
39	24
40	8
41	30
42	48
43	52
44	32
45	40
46	36
47	60
48	32
49	156
50	6
51	40
52	12
53	42
54	100
55	32
56	48
57	112
58	18
59	72
60	16
61	46
62	40
63	240
64	32
65	12
66	64
67	88
68	20
69	144
70	24
71	96
72	80
73	58
74	22
75	24
76	56
77	192
78	24
79	100
80	16
81	500

[1, 1, 4, 2, 2, 4, 12, 4, 20, 2, 16, 8, 6, 12, 8, 8, 10, 20, 28, 4, 48, 16, 36, 16, 6, 6, 100, 24, 18, 8, 40, 16, 64, 10, 24, 40, 22, 28, 24, 8, 30, 48, 52, 32, 40, 36, 60, 32, 156, 6, 40, 12, 42, 100, 32, 48, 112, 18, 72, 16, 46, 40, 240, 32, 12, 64, 88, 20, 144, 24, 96, 80, 58, 22, 24, 56, 192, 24, 100, 16, 500]

cp's OEIS Frontend

A354102 a(n) = phi(A267099(n)), 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

n	a(n)
1	1
2	1
3	4
4	2
5	2
6	4
7	12
8	4
9	20
10	2
11	16
12	8
13	6
14	12
15	8
16	8
17	10
18	20
19	28
20	4
21	48
22	16
23	36
24	16
25	6
26	6
27	100
28	24
29	18
30	8
31	40
32	16
33	64
34	10
35	24
36	40
37	22
38	28
39	24
40	8
41	30
42	48
43	52
44	32
45	40
46	36
47	60
48	32
49	156
50	6
51	40
52	12
53	42
54	100
55	32
56	48
57	112
58	18
59	72
60	16
61	46
62	40
63	240
64	32
65	12
66	64
67	88
68	20
69	144
70	24
71	96
72	80
73	58
74	22
75	24
76	56
77	192
78	24
79	100
80	16
81	500

n	a(n)
1	1
2	1
3	4
4	2
5	2
6	4
7	12
8	4
9	20
10	2
11	16
12	8
13	6
14	12
15	8
16	8
17	10
18	20
19	28
20	4
21	48
22	16
23	36
24	16
25	6
26	6
27	100
28	24
29	18
30	8
31	40
32	16
33	64
34	10
35	24
36	40
37	22
38	28
39	24
40	8
41	30
42	48
43	52
44	32
45	40
46	36
47	60
48	32
49	156
50	6
51	40
52	12
53	42
54	100
55	32
56	48
57	112
58	18
59	72
60	16
61	46
62	40
63	240
64	32
65	12
66	64
67	88
68	20
69	144
70	24
71	96
72	80
73	58
74	22
75	24
76	56
77	192
78	24
79	100
80	16
81	500

n	a(n)
1	1
2	1
3	4
4	2
5	2
6	4
7	12
8	4
9	20
10	2
11	16
12	8
13	6
14	12
15	8
16	8
17	10
18	20
19	28
20	4
21	48
22	16
23	36
24	16
25	6
26	6
27	100
28	24
29	18
30	8
31	40
32	16
33	64
34	10
35	24
36	40
37	22
38	28
39	24
40	8
41	30
42	48
43	52
44	32
45	40
46	36
47	60
48	32
49	156
50	6
51	40
52	12
53	42
54	100
55	32
56	48
57	112
58	18
59	72
60	16
61	46
62	40
63	240
64	32
65	12
66	64
67	88
68	20
69	144
70	24
71	96
72	80
73	58
74	22
75	24
76	56
77	192
78	24
79	100
80	16
81	500