A354101 - cp's OEIS frontend

A354101 a(n) = phi(A267099(n)) - phi(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	0
2	0
3	2
4	0
5	-2
6	2
7	6
8	0
9	14
10	-2
11	6
12	4
13	-6
14	6
15	0
16	0
17	-6
18	14
19	10
20	-4
21	36
22	6
23	14
24	8
25	-14
26	-6
27	82
28	12
29	-10
30	0
31	10
32	0
33	44
34	-6
35	0
36	28
37	-14
38	10
39	0
40	-8
41	-10
42	36
43	10
44	12
45	16
46	14
47	14
48	16
49	114
50	-14
51	8
52	-12
53	-10
54	82
55	-8
56	24
57	76
58	-10
59	14
60	0
61	-14
62	10
63	204
64	0
65	-36
66	44
67	22
68	-12
69	100
70	0
71	26
72	56
73	-14
74	-14
75	-16
76	20
77	132
78	0
79	22
80	-16

[0, 0, 2, 0, -2, 2, 6, 0, 14, -2, 6, 4, -6, 6, 0, 0, -6, 14, 10, -4, 36, 6, 14, 8, -14, -6, 82, 12, -10, 0, 10, 0, 44, -6, 0, 28, -14, 10, 0, -8, -10, 36, 10, 12, 16, 14, 14, 16, 114, -14, 8, -12, -10, 82, -8, 24, 76, -10, 14, 0, -14, 10, 204, 0, -36, 44, 22, -12, 100, 0, 26, 56, -14, -14, -16, 20, 132, 0, 22, -16]

cp's OEIS Frontend

A354101 a(n) = phi(A267099(n)) - phi(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	0
2	0
3	2
4	0
5	-2
6	2
7	6
8	0
9	14
10	-2
11	6
12	4
13	-6
14	6
15	0
16	0
17	-6
18	14
19	10
20	-4
21	36
22	6
23	14
24	8
25	-14
26	-6
27	82
28	12
29	-10
30	0
31	10
32	0
33	44
34	-6
35	0
36	28
37	-14
38	10
39	0
40	-8
41	-10
42	36
43	10
44	12
45	16
46	14
47	14
48	16
49	114
50	-14
51	8
52	-12
53	-10
54	82
55	-8
56	24
57	76
58	-10
59	14
60	0
61	-14
62	10
63	204
64	0
65	-36
66	44
67	22
68	-12
69	100
70	0
71	26
72	56
73	-14
74	-14
75	-16
76	20
77	132
78	0
79	22
80	-16

n	a(n)
1	0
2	0
3	2
4	0
5	-2
6	2
7	6
8	0
9	14
10	-2
11	6
12	4
13	-6
14	6
15	0
16	0
17	-6
18	14
19	10
20	-4
21	36
22	6
23	14
24	8
25	-14
26	-6
27	82
28	12
29	-10
30	0
31	10
32	0
33	44
34	-6
35	0
36	28
37	-14
38	10
39	0
40	-8
41	-10
42	36
43	10
44	12
45	16
46	14
47	14
48	16
49	114
50	-14
51	8
52	-12
53	-10
54	82
55	-8
56	24
57	76
58	-10
59	14
60	0
61	-14
62	10
63	204
64	0
65	-36
66	44
67	22
68	-12
69	100
70	0
71	26
72	56
73	-14
74	-14
75	-16
76	20
77	132
78	0
79	22
80	-16

n	a(n)
1	0
2	0
3	2
4	0
5	-2
6	2
7	6
8	0
9	14
10	-2
11	6
12	4
13	-6
14	6
15	0
16	0
17	-6
18	14
19	10
20	-4
21	36
22	6
23	14
24	8
25	-14
26	-6
27	82
28	12
29	-10
30	0
31	10
32	0
33	44
34	-6
35	0
36	28
37	-14
38	10
39	0
40	-8
41	-10
42	36
43	10
44	12
45	16
46	14
47	14
48	16
49	114
50	-14
51	8
52	-12
53	-10
54	82
55	-8
56	24
57	76
58	-10
59	14
60	0
61	-14
62	10
63	204
64	0
65	-36
66	44
67	22
68	-12
69	100
70	0
71	26
72	56
73	-14
74	-14
75	-16
76	20
77	132
78	0
79	22
80	-16