A067240 - cp's OEIS frontend

A067240 If n = Product_{i} p_i^e_i, a(n) = Sum_{i} (p_i - 1)*p_i^(e_i - 1).

n	a(n)
1	0
2	1
3	2
4	2
5	4
6	3
7	6
8	4
9	6
10	5
11	10
12	4
13	12
14	7
15	6
16	8
17	16
18	7
19	18
20	6
21	8
22	11
23	22
24	6
25	20
26	13
27	18
28	8
29	28
30	7
31	30
32	16
33	12
34	17
35	10
36	8
37	36
38	19
39	14
40	8
41	40
42	9
43	42
44	12
45	10
46	23
47	46
48	10
49	42
50	21
51	18
52	14
53	52
54	19
55	14
56	10
57	20
58	29
59	58
60	8
61	60
62	31
63	12
64	32
65	16
66	13
67	66
68	18
69	24
70	11
71	70
72	10
73	72
74	37
75	22
76	20
77	16
78	15
79	78
80	12
81	54
82	41
83	82
84	10
85	20
86	43
87	30
88	14
89	88
90	11
91	18
92	24
93	32
94	47
95	22
96	18
97	96
98	43
99	16
100	22

[0, 1, 2, 2, 4, 3, 6, 4, 6, 5, 10, 4, 12, 7, 6, 8, 16, 7, 18, 6, 8, 11, 22, 6, 20, 13, 18, 8, 28, 7, 30, 16, 12, 17, 10, 8, 36, 19, 14, 8, 40, 9, 42, 12, 10, 23, 46, 10, 42, 21, 18, 14, 52, 19, 14, 10, 20, 29, 58, 8, 60, 31, 12, 32, 16, 13, 66, 18, 24, 11, 70, 10, 72, 37, 22, 20, 16, 15, 78, 12, 54, 41, 82, 10, 20, 43, 30, 14, 88, 11, 18, 24, 32, 47, 22, 18, 96, 43, 16, 22]

cp's OEIS Frontend

A067240 If n = Product_{i} p_i^e_i, a(n) = Sum_{i} (p_i - 1)*p_i^(e_i - 1).

Table of values

List of values

n	a(n)
1	0
2	1
3	2
4	2
5	4
6	3
7	6
8	4
9	6
10	5
11	10
12	4
13	12
14	7
15	6
16	8
17	16
18	7
19	18
20	6
21	8
22	11
23	22
24	6
25	20
26	13
27	18
28	8
29	28
30	7
31	30
32	16
33	12
34	17
35	10
36	8
37	36
38	19
39	14
40	8
41	40
42	9
43	42
44	12
45	10
46	23
47	46
48	10
49	42
50	21
51	18
52	14
53	52
54	19
55	14
56	10
57	20
58	29
59	58
60	8
61	60
62	31
63	12
64	32
65	16
66	13
67	66
68	18
69	24
70	11
71	70
72	10
73	72
74	37
75	22
76	20
77	16
78	15
79	78
80	12
81	54
82	41
83	82
84	10
85	20
86	43
87	30
88	14
89	88
90	11
91	18
92	24
93	32
94	47
95	22
96	18
97	96
98	43
99	16
100	22

n	a(n)
1	0
2	1
3	2
4	2
5	4
6	3
7	6
8	4
9	6
10	5
11	10
12	4
13	12
14	7
15	6
16	8
17	16
18	7
19	18
20	6
21	8
22	11
23	22
24	6
25	20
26	13
27	18
28	8
29	28
30	7
31	30
32	16
33	12
34	17
35	10
36	8
37	36
38	19
39	14
40	8
41	40
42	9
43	42
44	12
45	10
46	23
47	46
48	10
49	42
50	21
51	18
52	14
53	52
54	19
55	14
56	10
57	20
58	29
59	58
60	8
61	60
62	31
63	12
64	32
65	16
66	13
67	66
68	18
69	24
70	11
71	70
72	10
73	72
74	37
75	22
76	20
77	16
78	15
79	78
80	12
81	54
82	41
83	82
84	10
85	20
86	43
87	30
88	14
89	88
90	11
91	18
92	24
93	32
94	47
95	22
96	18
97	96
98	43
99	16
100	22

n	a(n)
1	0
2	1
3	2
4	2
5	4
6	3
7	6
8	4
9	6
10	5
11	10
12	4
13	12
14	7
15	6
16	8
17	16
18	7
19	18
20	6
21	8
22	11
23	22
24	6
25	20
26	13
27	18
28	8
29	28
30	7
31	30
32	16
33	12
34	17
35	10
36	8
37	36
38	19
39	14
40	8
41	40
42	9
43	42
44	12
45	10
46	23
47	46
48	10
49	42
50	21
51	18
52	14
53	52
54	19
55	14
56	10
57	20
58	29
59	58
60	8
61	60
62	31
63	12
64	32
65	16
66	13
67	66
68	18
69	24
70	11
71	70
72	10
73	72
74	37
75	22
76	20
77	16
78	15
79	78
80	12
81	54
82	41
83	82
84	10
85	20
86	43
87	30
88	14
89	88
90	11
91	18
92	24
93	32
94	47
95	22
96	18
97	96
98	43
99	16
100	22