A304818 - cp's OEIS frontend

A304818 If n = Product_i p(y_i) where p(i) is the i-th prime number and y_i <= y_j for i < j, then a(n) = Sum_i y_i*i.

n	a(n)
1	0
2	1
3	2
4	3
5	3
6	5
7	4
8	6
9	6
10	7
11	5
12	9
13	6
14	9
15	8
16	10
17	7
18	11
19	8
20	12
21	10
22	11
23	9
24	14
25	9
26	13
27	12
28	15
29	10
30	14
31	11
32	15
33	12
34	15
35	11
36	17
37	12
38	17
39	14
40	18
41	13
42	17
43	14
44	18
45	15
46	19
47	15
48	20
49	12
50	16
51	16
52	21
53	16
54	19
55	13
56	22
57	18
58	21
59	17
60	21
61	18
62	23
63	18
64	21
65	15
66	20
67	19
68	24
69	20
70	19

[0, 1, 2, 3, 3, 5, 4, 6, 6, 7, 5, 9, 6, 9, 8, 10, 7, 11, 8, 12, 10, 11, 9, 14, 9, 13, 12, 15, 10, 14, 11, 15, 12, 15, 11, 17, 12, 17, 14, 18, 13, 17, 14, 18, 15, 19, 15, 20, 12, 16, 16, 21, 16, 19, 13, 22, 18, 21, 17, 21, 18, 23, 18, 21, 15, 20, 19, 24, 20, 19]

cp's OEIS Frontend

A304818 If n = Product_i p(y_i) where p(i) is the i-th prime number and y_i <= y_j for i < j, then a(n) = Sum_i y_i*i.

Table of values

List of values

n	a(n)
1	0
2	1
3	2
4	3
5	3
6	5
7	4
8	6
9	6
10	7
11	5
12	9
13	6
14	9
15	8
16	10
17	7
18	11
19	8
20	12
21	10
22	11
23	9
24	14
25	9
26	13
27	12
28	15
29	10
30	14
31	11
32	15
33	12
34	15
35	11
36	17
37	12
38	17
39	14
40	18
41	13
42	17
43	14
44	18
45	15
46	19
47	15
48	20
49	12
50	16
51	16
52	21
53	16
54	19
55	13
56	22
57	18
58	21
59	17
60	21
61	18
62	23
63	18
64	21
65	15
66	20
67	19
68	24
69	20
70	19

n	a(n)
1	0
2	1
3	2
4	3
5	3
6	5
7	4
8	6
9	6
10	7
11	5
12	9
13	6
14	9
15	8
16	10
17	7
18	11
19	8
20	12
21	10
22	11
23	9
24	14
25	9
26	13
27	12
28	15
29	10
30	14
31	11
32	15
33	12
34	15
35	11
36	17
37	12
38	17
39	14
40	18
41	13
42	17
43	14
44	18
45	15
46	19
47	15
48	20
49	12
50	16
51	16
52	21
53	16
54	19
55	13
56	22
57	18
58	21
59	17
60	21
61	18
62	23
63	18
64	21
65	15
66	20
67	19
68	24
69	20
70	19

n	a(n)
1	0
2	1
3	2
4	3
5	3
6	5
7	4
8	6
9	6
10	7
11	5
12	9
13	6
14	9
15	8
16	10
17	7
18	11
19	8
20	12
21	10
22	11
23	9
24	14
25	9
26	13
27	12
28	15
29	10
30	14
31	11
32	15
33	12
34	15
35	11
36	17
37	12
38	17
39	14
40	18
41	13
42	17
43	14
44	18
45	15
46	19
47	15
48	20
49	12
50	16
51	16
52	21
53	16
54	19
55	13
56	22
57	18
58	21
59	17
60	21
61	18
62	23
63	18
64	21
65	15
66	20
67	19
68	24
69	20
70	19