A110179 - cp's OEIS frontend

A110179 Least k such that phi(n+k) = 2*phi(n), where phi is Euler's totient function.

n	a(n)
1	2
2	1
3	2
4	1
5	10
6	2
7	6
8	7
9	4
10	5
11	14
12	3
13	22
14	7
15	2
16	1
17	34
18	3
19	18
20	12
21	14
22	3
23	46
24	8
25	16
26	9
27	10
28	7
29	58
30	2
31	30
32	19
33	8
34	17
35	30
36	3
37	36
38	19
39	26
40	11
41	82
42	3
43	86
44	11
45	20
46	23
47	94
48	3
49	80
50	5
51	34
52	13
53	106
54	3
55	68
56	9
57	16
58	29
59	118
60	4
61	82
62	15
63	10
64	21
65	32
66	9
67	94
68	17
69	20
70	34
71	142
72	32
73	112
74	17
75	48
76	15
77	66
78	26

[2, 1, 2, 1, 10, 2, 6, 7, 4, 5, 14, 3, 22, 7, 2, 1, 34, 3, 18, 12, 14, 3, 46, 8, 16, 9, 10, 7, 58, 2, 30, 19, 8, 17, 30, 3, 36, 19, 26, 11, 82, 3, 86, 11, 20, 23, 94, 3, 80, 5, 34, 13, 106, 3, 68, 9, 16, 29, 118, 4, 82, 15, 10, 21, 32, 9, 94, 17, 20, 34, 142, 32, 112, 17, 48, 15, 66, 26]

cp's OEIS Frontend

A110179 Least k such that phi(n+k) = 2*phi(n), where phi is Euler's totient function.

Table of values

List of values

n	a(n)
1	2
2	1
3	2
4	1
5	10
6	2
7	6
8	7
9	4
10	5
11	14
12	3
13	22
14	7
15	2
16	1
17	34
18	3
19	18
20	12
21	14
22	3
23	46
24	8
25	16
26	9
27	10
28	7
29	58
30	2
31	30
32	19
33	8
34	17
35	30
36	3
37	36
38	19
39	26
40	11
41	82
42	3
43	86
44	11
45	20
46	23
47	94
48	3
49	80
50	5
51	34
52	13
53	106
54	3
55	68
56	9
57	16
58	29
59	118
60	4
61	82
62	15
63	10
64	21
65	32
66	9
67	94
68	17
69	20
70	34
71	142
72	32
73	112
74	17
75	48
76	15
77	66
78	26

n	a(n)
1	2
2	1
3	2
4	1
5	10
6	2
7	6
8	7
9	4
10	5
11	14
12	3
13	22
14	7
15	2
16	1
17	34
18	3
19	18
20	12
21	14
22	3
23	46
24	8
25	16
26	9
27	10
28	7
29	58
30	2
31	30
32	19
33	8
34	17
35	30
36	3
37	36
38	19
39	26
40	11
41	82
42	3
43	86
44	11
45	20
46	23
47	94
48	3
49	80
50	5
51	34
52	13
53	106
54	3
55	68
56	9
57	16
58	29
59	118
60	4
61	82
62	15
63	10
64	21
65	32
66	9
67	94
68	17
69	20
70	34
71	142
72	32
73	112
74	17
75	48
76	15
77	66
78	26

n	a(n)
1	2
2	1
3	2
4	1
5	10
6	2
7	6
8	7
9	4
10	5
11	14
12	3
13	22
14	7
15	2
16	1
17	34
18	3
19	18
20	12
21	14
22	3
23	46
24	8
25	16
26	9
27	10
28	7
29	58
30	2
31	30
32	19
33	8
34	17
35	30
36	3
37	36
38	19
39	26
40	11
41	82
42	3
43	86
44	11
45	20
46	23
47	94
48	3
49	80
50	5
51	34
52	13
53	106
54	3
55	68
56	9
57	16
58	29
59	118
60	4
61	82
62	15
63	10
64	21
65	32
66	9
67	94
68	17
69	20
70	34
71	142
72	32
73	112
74	17
75	48
76	15
77	66
78	26