A331081 - cp's OEIS frontend

A331081 a(n) = Sum_{i=1..n} d_3(i)*d_3(i+1)/3, where d_3(n) = A007425(n).

n	a(n)
1	1
2	4
3	10
4	16
5	25
6	34
7	44
8	64
9	82
10	91
11	109
12	127
13	136
14	163
15	208
16	223
17	241
18	259
19	277
20	331
21	358
22	367
23	397
24	457
25	475
26	505
27	565
28	583
29	610
30	637
31	658
32	721
33	748
34	775
35	883
36	919
37	928
38	955
39	1045
40	1075
41	1102
42	1129
43	1147
44	1255
45	1309
46	1318
47	1363
48	1453
49	1489
50	1543
51	1597
52	1615
53	1645
54	1735
55	1825
56	1915
57	1942
58	1951
59	2005
60	2059

[1, 4, 10, 16, 25, 34, 44, 64, 82, 91, 109, 127, 136, 163, 208, 223, 241, 259, 277, 331, 358, 367, 397, 457, 475, 505, 565, 583, 610, 637, 658, 721, 748, 775, 883, 919, 928, 955, 1045, 1075, 1102, 1129, 1147, 1255, 1309, 1318, 1363, 1453, 1489, 1543, 1597, 1615, 1645, 1735, 1825, 1915, 1942, 1951, 2005, 2059]

cp's OEIS Frontend

A331081 a(n) = Sum_{i=1..n} d_3(i)*d_3(i+1)/3, where d_3(n) = A007425(n).

Table of values

List of values