A347100 - cp's OEIS frontend

A347100 a(n) = phi(A003961(n)) - phi(n), where A003961 is the prime shift towards larger primes, and phi is Euler totient function.

n	a(n)
1	0
2	1
3	2
4	4
5	2
6	6
7	4
8	14
9	14
10	8
11	2
12	20
13	4
14	14
15	16
16	46
17	2
18	34
19	4
20	28
21	28
22	14
23	6
24	64
25	22
26	20
27	82
28	48
29	2
30	40
31	6
32	146
33	28
34	20
35	36
36	108
37	4
38	26
39	40
40	92
41	2
42	68
43	4
44	52
45	96
46	34
47	6
48	200
49	68
50	64
51	40
52	72
53	6
54	182
55	32
56	156
57	52
58	32
59	2
60	128
61	6
62	42
63	164
64	454
65	48
66	76
67	4
68	76
69	68
70	96
71	2
72	336
73	6
74	44
75	128
76	96
77	60
78	104
79	4
80	292
81	446
82	44
83	6

[0, 1, 2, 4, 2, 6, 4, 14, 14, 8, 2, 20, 4, 14, 16, 46, 2, 34, 4, 28, 28, 14, 6, 64, 22, 20, 82, 48, 2, 40, 6, 146, 28, 20, 36, 108, 4, 26, 40, 92, 2, 68, 4, 52, 96, 34, 6, 200, 68, 64, 40, 72, 6, 182, 32, 156, 52, 32, 2, 128, 6, 42, 164, 454, 48, 76, 4, 76, 68, 96, 2, 336, 6, 44, 128, 96, 60, 104, 4, 292, 446, 44, 6]

cp's OEIS Frontend

A347100 a(n) = phi(A003961(n)) - phi(n), where A003961 is the prime shift towards larger primes, and phi is Euler totient function.

Table of values

List of values

n	a(n)
1	0
2	1
3	2
4	4
5	2
6	6
7	4
8	14
9	14
10	8
11	2
12	20
13	4
14	14
15	16
16	46
17	2
18	34
19	4
20	28
21	28
22	14
23	6
24	64
25	22
26	20
27	82
28	48
29	2
30	40
31	6
32	146
33	28
34	20
35	36
36	108
37	4
38	26
39	40
40	92
41	2
42	68
43	4
44	52
45	96
46	34
47	6
48	200
49	68
50	64
51	40
52	72
53	6
54	182
55	32
56	156
57	52
58	32
59	2
60	128
61	6
62	42
63	164
64	454
65	48
66	76
67	4
68	76
69	68
70	96
71	2
72	336
73	6
74	44
75	128
76	96
77	60
78	104
79	4
80	292
81	446
82	44
83	6

n	a(n)
1	0
2	1
3	2
4	4
5	2
6	6
7	4
8	14
9	14
10	8
11	2
12	20
13	4
14	14
15	16
16	46
17	2
18	34
19	4
20	28
21	28
22	14
23	6
24	64
25	22
26	20
27	82
28	48
29	2
30	40
31	6
32	146
33	28
34	20
35	36
36	108
37	4
38	26
39	40
40	92
41	2
42	68
43	4
44	52
45	96
46	34
47	6
48	200
49	68
50	64
51	40
52	72
53	6
54	182
55	32
56	156
57	52
58	32
59	2
60	128
61	6
62	42
63	164
64	454
65	48
66	76
67	4
68	76
69	68
70	96
71	2
72	336
73	6
74	44
75	128
76	96
77	60
78	104
79	4
80	292
81	446
82	44
83	6

n	a(n)
1	0
2	1
3	2
4	4
5	2
6	6
7	4
8	14
9	14
10	8
11	2
12	20
13	4
14	14
15	16
16	46
17	2
18	34
19	4
20	28
21	28
22	14
23	6
24	64
25	22
26	20
27	82
28	48
29	2
30	40
31	6
32	146
33	28
34	20
35	36
36	108
37	4
38	26
39	40
40	92
41	2
42	68
43	4
44	52
45	96
46	34
47	6
48	200
49	68
50	64
51	40
52	72
53	6
54	182
55	32
56	156
57	52
58	32
59	2
60	128
61	6
62	42
63	164
64	454
65	48
66	76
67	4
68	76
69	68
70	96
71	2
72	336
73	6
74	44
75	128
76	96
77	60
78	104
79	4
80	292
81	446
82	44
83	6