A035532 - cp's OEIS frontend

A035532 a(n) = 2phi(n) if n composite, or 2phi(n) - (A000120(n)-1) if n prime, where phi = A000010, Euler's totient function, and a(1) = 1.

n	a(n)
1	1
2	2
3	3
4	4
5	7
6	4
7	10
8	8
9	12
10	8
11	18
12	8
13	22
14	12
15	16
16	16
17	31
18	12
19	34
20	16
21	24
22	20
23	41
24	16
25	40
26	24
27	36
28	24
29	53
30	16
31	56
32	32
33	40
34	32
35	48
36	24
37	70
38	36
39	48
40	32
41	78
42	24
43	81
44	40
45	48
46	44
47	88
48	32
49	84
50	40
51	64
52	48
53	101
54	36
55	80
56	48
57	72
58	56
59	112
60	32
61	116
62	60
63	72
64	64
65	96
66	40
67	130
68	64
69	88
70	48
71	137

[1, 2, 3, 4, 7, 4, 10, 8, 12, 8, 18, 8, 22, 12, 16, 16, 31, 12, 34, 16, 24, 20, 41, 16, 40, 24, 36, 24, 53, 16, 56, 32, 40, 32, 48, 24, 70, 36, 48, 32, 78, 24, 81, 40, 48, 44, 88, 32, 84, 40, 64, 48, 101, 36, 80, 48, 72, 56, 112, 32, 116, 60, 72, 64, 96, 40, 130, 64, 88, 48, 137]

cp's OEIS Frontend

A035532 a(n) = 2phi(n) if n composite, or 2phi(n) - (A000120(n)-1) if n prime, where phi = A000010, Euler's totient function, and a(1) = 1.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	7
6	4
7	10
8	8
9	12
10	8
11	18
12	8
13	22
14	12
15	16
16	16
17	31
18	12
19	34
20	16
21	24
22	20
23	41
24	16
25	40
26	24
27	36
28	24
29	53
30	16
31	56
32	32
33	40
34	32
35	48
36	24
37	70
38	36
39	48
40	32
41	78
42	24
43	81
44	40
45	48
46	44
47	88
48	32
49	84
50	40
51	64
52	48
53	101
54	36
55	80
56	48
57	72
58	56
59	112
60	32
61	116
62	60
63	72
64	64
65	96
66	40
67	130
68	64
69	88
70	48
71	137

n	a(n)
1	1
2	2
3	3
4	4
5	7
6	4
7	10
8	8
9	12
10	8
11	18
12	8
13	22
14	12
15	16
16	16
17	31
18	12
19	34
20	16
21	24
22	20
23	41
24	16
25	40
26	24
27	36
28	24
29	53
30	16
31	56
32	32
33	40
34	32
35	48
36	24
37	70
38	36
39	48
40	32
41	78
42	24
43	81
44	40
45	48
46	44
47	88
48	32
49	84
50	40
51	64
52	48
53	101
54	36
55	80
56	48
57	72
58	56
59	112
60	32
61	116
62	60
63	72
64	64
65	96
66	40
67	130
68	64
69	88
70	48
71	137

cp's OEIS Frontend

A035532 a(n) = 2*phi(n) if n composite, or 2*phi(n) - (A000120(n)-1) if n prime, where phi = A000010, Euler's totient function, and a(1) = 1.

Table of values

List of values

A035532 a(n) = 2phi(n) if n composite, or 2phi(n) - (A000120(n)-1) if n prime, where phi = A000010, Euler's totient function, and a(1) = 1.

n	a(n)
1	1
2	2
3	3
4	4
5	7
6	4
7	10
8	8
9	12
10	8
11	18
12	8
13	22
14	12
15	16
16	16
17	31
18	12
19	34
20	16
21	24
22	20
23	41
24	16
25	40
26	24
27	36
28	24
29	53
30	16
31	56
32	32
33	40
34	32
35	48
36	24
37	70
38	36
39	48
40	32
41	78
42	24
43	81
44	40
45	48
46	44
47	88
48	32
49	84
50	40
51	64
52	48
53	101
54	36
55	80
56	48
57	72
58	56
59	112
60	32
61	116
62	60
63	72
64	64
65	96
66	40
67	130
68	64
69	88
70	48
71	137