A351168 - cp's OEIS frontend

A351168 If n = p_1^e_1 * ... * p_k^e_k, where p_1 < ... < p_k are primes, then a(n) is obtained by replacing the last factor p_k^e_k by (p_k - 1)^e_k; a(1) = 1.

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

[1, 1, 2, 1, 4, 4, 6, 1, 4, 8, 10, 8, 12, 12, 12, 1, 16, 8, 18, 16, 18, 20, 22, 16, 16, 24, 8, 24, 28, 24, 30, 1, 30, 32, 30, 16, 36, 36, 36, 32, 40, 36, 42, 40, 36, 44, 46, 32, 36, 32, 48, 48, 52, 16, 50, 48, 54, 56, 58, 48, 60, 60, 54, 1, 60, 60, 66, 64, 66, 60, 70, 32, 72, 72, 48]

cp's OEIS Frontend

A351168 If n = p_1^e_1 * ... * p_k^e_k, where p_1 < ... < p_k are primes, then a(n) is obtained by replacing the last factor p_k^e_k by (p_k - 1)^e_k; a(1) = 1.

Table of values

List of values

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

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

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