A280385 - cp's OEIS frontend

A280385 a(n) = Sum_{k=1..n} prime(k)^2*floor(n/prime(k)) .

n	a(n)
1	0
2	4
3	13
4	17
5	42
6	55
7	104
8	108
9	117
10	146
11	267
12	280
13	449
14	502
15	536
16	540
17	829
18	842
19	1203
20	1232
21	1290
22	1415
23	1944
24	1957
25	1982
26	2155
27	2164
28	2217
29	3058
30	3096
31	4057
32	4061
33	4191
34	4484
35	4558
36	4571
37	5940
38	6305
39	6483
40	6512
41	8193
42	8255
43	10104
44	10229
45	10263
46	10796
47	13005
48	13018
49	13067
50	13096
51	13394
52	13567
53	16376
54	16389
55	16535

[0, 4, 13, 17, 42, 55, 104, 108, 117, 146, 267, 280, 449, 502, 536, 540, 829, 842, 1203, 1232, 1290, 1415, 1944, 1957, 1982, 2155, 2164, 2217, 3058, 3096, 4057, 4061, 4191, 4484, 4558, 4571, 5940, 6305, 6483, 6512, 8193, 8255, 10104, 10229, 10263, 10796, 13005, 13018, 13067, 13096, 13394, 13567, 16376, 16389, 16535]

cp's OEIS Frontend

A280385 a(n) = Sum_{k=1..n} prime(k)^2*floor(n/prime(k)) .

Table of values

List of values