A368612 - cp's OEIS frontend

A368612 a(n) = Sum_{k=2..n} pi(k-1) * ceiling(n/k).

n	a(n)
1	0
2	0
3	1
4	4
5	8
6	13
7	20
8	27
9	37
10	46
11	56
12	65
13	81
14	92
15	107
16	122
17	140
18	153
19	175
20	190
21	214
22	234
23	254
24	271
25	304
26	324
27	347
28	370
29	399
30	418
31	454
32	475
33	509
34	536
35	564
36	591
37	635
38	658
39	689
40	719
41	763
42	788
43	835
44	862
45	904
46	945
47	981
48	1010
49	1070
50	1103
51	1148
52	1185
53	1231
54	1262
55	1318
56	1356

[0, 0, 1, 4, 8, 13, 20, 27, 37, 46, 56, 65, 81, 92, 107, 122, 140, 153, 175, 190, 214, 234, 254, 271, 304, 324, 347, 370, 399, 418, 454, 475, 509, 536, 564, 591, 635, 658, 689, 719, 763, 788, 835, 862, 904, 945, 981, 1010, 1070, 1103, 1148, 1185, 1231, 1262, 1318, 1356]

cp's OEIS Frontend

A368612 a(n) = Sum_{k=2..n} pi(k-1) * ceiling(n/k).

Table of values

List of values