A066426 - cp's OEIS frontend

A066426 Conjectured values for a(n) = least natural number k such that phi(n+k) = phi(n) + phi(k), if k exists; otherwise 0.

n	a(n)
1	2
2	1
3	0
4	4
5	4
6	4
7	14
8	6
9	6
10	4
11	16
12	6
13	14
14	6
15	0
16	5
17	8
18	6
19	6
20	8
21	0
22	4
23	46
24	12
25	10
26	8
27	6
28	12
29	26
30	12
31	62
32	6
33	12
34	4
35	16
36	12
37	28
38	6
39	0
40	10
41	24
42	24
43	86
44	8
45	0
46	6
47	38
48	6
49	62
50	25
51	12
52	16
53	24
54	18
55	32
56	24
57	0
58	4
59	118
60	24
61	80
62	6
63	12
64	10
65	28
66	12
67	134
68	8
69	0
70	35
71	142
72	24
73	146
74	8
75	30
76	12
77	8
78	24
79	46
80	20
81	6

[2, 1, 0, 4, 4, 4, 14, 6, 6, 4, 16, 6, 14, 6, 0, 5, 8, 6, 6, 8, 0, 4, 46, 12, 10, 8, 6, 12, 26, 12, 62, 6, 12, 4, 16, 12, 28, 6, 0, 10, 24, 24, 86, 8, 0, 6, 38, 6, 62, 25, 12, 16, 24, 18, 32, 24, 0, 4, 118, 24, 80, 6, 12, 10, 28, 12, 134, 8, 0, 35, 142, 24, 146, 8, 30, 12, 8, 24, 46, 20, 6]

cp's OEIS Frontend

A066426 Conjectured values for a(n) = least natural number k such that phi(n+k) = phi(n) + phi(k), if k exists; otherwise 0.

Table of values

List of values

n	a(n)
1	2
2	1
3	0
4	4
5	4
6	4
7	14
8	6
9	6
10	4
11	16
12	6
13	14
14	6
15	0
16	5
17	8
18	6
19	6
20	8
21	0
22	4
23	46
24	12
25	10
26	8
27	6
28	12
29	26
30	12
31	62
32	6
33	12
34	4
35	16
36	12
37	28
38	6
39	0
40	10
41	24
42	24
43	86
44	8
45	0
46	6
47	38
48	6
49	62
50	25
51	12
52	16
53	24
54	18
55	32
56	24
57	0
58	4
59	118
60	24
61	80
62	6
63	12
64	10
65	28
66	12
67	134
68	8
69	0
70	35
71	142
72	24
73	146
74	8
75	30
76	12
77	8
78	24
79	46
80	20
81	6

n	a(n)
1	2
2	1
3	0
4	4
5	4
6	4
7	14
8	6
9	6
10	4
11	16
12	6
13	14
14	6
15	0
16	5
17	8
18	6
19	6
20	8
21	0
22	4
23	46
24	12
25	10
26	8
27	6
28	12
29	26
30	12
31	62
32	6
33	12
34	4
35	16
36	12
37	28
38	6
39	0
40	10
41	24
42	24
43	86
44	8
45	0
46	6
47	38
48	6
49	62
50	25
51	12
52	16
53	24
54	18
55	32
56	24
57	0
58	4
59	118
60	24
61	80
62	6
63	12
64	10
65	28
66	12
67	134
68	8
69	0
70	35
71	142
72	24
73	146
74	8
75	30
76	12
77	8
78	24
79	46
80	20
81	6

n	a(n)
1	2
2	1
3	0
4	4
5	4
6	4
7	14
8	6
9	6
10	4
11	16
12	6
13	14
14	6
15	0
16	5
17	8
18	6
19	6
20	8
21	0
22	4
23	46
24	12
25	10
26	8
27	6
28	12
29	26
30	12
31	62
32	6
33	12
34	4
35	16
36	12
37	28
38	6
39	0
40	10
41	24
42	24
43	86
44	8
45	0
46	6
47	38
48	6
49	62
50	25
51	12
52	16
53	24
54	18
55	32
56	24
57	0
58	4
59	118
60	24
61	80
62	6
63	12
64	10
65	28
66	12
67	134
68	8
69	0
70	35
71	142
72	24
73	146
74	8
75	30
76	12
77	8
78	24
79	46
80	20
81	6