A331077 - cp's OEIS frontend

A331077 a(n) = Sum_{k = 1..n} [d(k)*d_3(k)], where d = A000005, d_3 = A007425.

n	a(n)
1	1
2	7
3	13
4	31
5	37
6	73
7	79
8	119
9	137
10	173
11	179
12	287
13	293
14	329
15	365
16	440
17	446
18	554
19	560
20	668
21	704
22	740
23	746
24	986
25	1004
26	1040
27	1080
28	1188
29	1194
30	1410
31	1416
32	1542
33	1578
34	1614
35	1650
36	1974
37	1980
38	2016
39	2052
40	2292
41	2298
42	2514
43	2520
44	2628
45	2736
46	2772
47	2778
48	3228
49	3246
50	3354
51	3390
52	3498
53	3504
54	3744
55	3780
56	4020
57	4056

[1, 7, 13, 31, 37, 73, 79, 119, 137, 173, 179, 287, 293, 329, 365, 440, 446, 554, 560, 668, 704, 740, 746, 986, 1004, 1040, 1080, 1188, 1194, 1410, 1416, 1542, 1578, 1614, 1650, 1974, 1980, 2016, 2052, 2292, 2298, 2514, 2520, 2628, 2736, 2772, 2778, 3228, 3246, 3354, 3390, 3498, 3504, 3744, 3780, 4020, 4056]

cp's OEIS Frontend

A331077 a(n) = Sum_{k = 1..n} [d(k)*d_3(k)], where d = A000005, d_3 = A007425.

Table of values

List of values