A344875 - cp's OEIS frontend

A344875 Multiplicative with a(2^e) = 2^(1+e) - 1, and a(p^e) = p^e - 1 for odd primes p.

n	a(n)
1	1
2	3
3	2
4	7
5	4
6	6
7	6
8	15
9	8
10	12
11	10
12	14
13	12
14	18
15	8
16	31
17	16
18	24
19	18
20	28
21	12
22	30
23	22
24	30
25	24
26	36
27	26
28	42
29	28
30	24
31	30
32	63
33	20
34	48
35	24
36	56
37	36
38	54
39	24
40	60
41	40
42	36
43	42
44	70
45	32
46	66
47	46
48	62
49	48
50	72
51	32
52	84
53	52
54	78
55	40
56	90
57	36
58	84
59	58
60	56
61	60
62	90
63	48
64	127
65	48
66	60
67	66
68	112
69	44
70	72
71	70
72	120
73	72
74	108
75	48
76	126
77	60
78	72
79	78
80	124
81	80
82	120

[1, 3, 2, 7, 4, 6, 6, 15, 8, 12, 10, 14, 12, 18, 8, 31, 16, 24, 18, 28, 12, 30, 22, 30, 24, 36, 26, 42, 28, 24, 30, 63, 20, 48, 24, 56, 36, 54, 24, 60, 40, 36, 42, 70, 32, 66, 46, 62, 48, 72, 32, 84, 52, 78, 40, 90, 36, 84, 58, 56, 60, 90, 48, 127, 48, 60, 66, 112, 44, 72, 70, 120, 72, 108, 48, 126, 60, 72, 78, 124, 80, 120]

cp's OEIS Frontend

A344875 Multiplicative with a(2^e) = 2^(1+e) - 1, and a(p^e) = p^e - 1 for odd primes p.

Table of values

List of values

n	a(n)
1	1
2	3
3	2
4	7
5	4
6	6
7	6
8	15
9	8
10	12
11	10
12	14
13	12
14	18
15	8
16	31
17	16
18	24
19	18
20	28
21	12
22	30
23	22
24	30
25	24
26	36
27	26
28	42
29	28
30	24
31	30
32	63
33	20
34	48
35	24
36	56
37	36
38	54
39	24
40	60
41	40
42	36
43	42
44	70
45	32
46	66
47	46
48	62
49	48
50	72
51	32
52	84
53	52
54	78
55	40
56	90
57	36
58	84
59	58
60	56
61	60
62	90
63	48
64	127
65	48
66	60
67	66
68	112
69	44
70	72
71	70
72	120
73	72
74	108
75	48
76	126
77	60
78	72
79	78
80	124
81	80
82	120

n	a(n)
1	1
2	3
3	2
4	7
5	4
6	6
7	6
8	15
9	8
10	12
11	10
12	14
13	12
14	18
15	8
16	31
17	16
18	24
19	18
20	28
21	12
22	30
23	22
24	30
25	24
26	36
27	26
28	42
29	28
30	24
31	30
32	63
33	20
34	48
35	24
36	56
37	36
38	54
39	24
40	60
41	40
42	36
43	42
44	70
45	32
46	66
47	46
48	62
49	48
50	72
51	32
52	84
53	52
54	78
55	40
56	90
57	36
58	84
59	58
60	56
61	60
62	90
63	48
64	127
65	48
66	60
67	66
68	112
69	44
70	72
71	70
72	120
73	72
74	108
75	48
76	126
77	60
78	72
79	78
80	124
81	80
82	120

n	a(n)
1	1
2	3
3	2
4	7
5	4
6	6
7	6
8	15
9	8
10	12
11	10
12	14
13	12
14	18
15	8
16	31
17	16
18	24
19	18
20	28
21	12
22	30
23	22
24	30
25	24
26	36
27	26
28	42
29	28
30	24
31	30
32	63
33	20
34	48
35	24
36	56
37	36
38	54
39	24
40	60
41	40
42	36
43	42
44	70
45	32
46	66
47	46
48	62
49	48
50	72
51	32
52	84
53	52
54	78
55	40
56	90
57	36
58	84
59	58
60	56
61	60
62	90
63	48
64	127
65	48
66	60
67	66
68	112
69	44
70	72
71	70
72	120
73	72
74	108
75	48
76	126
77	60
78	72
79	78
80	124
81	80
82	120