A344600 - cp's OEIS frontend

A344600 a(n) = Sum_{k=1..n} phi(k) * (floor(n/k)^4 - floor((n-1)/k)^4).

n	a(n)
1	1
2	16
3	67
4	192
5	373
6	768
7	1111
8	1904
9	2601
10	3872
11	4651
12	7280
13	7837
14	11056
15	13215
16	17024
17	18001
18	25488
19	25363
20	34624
21	37093
22	44576
23	45607
24	63440
25	60345
26	74368
27	79803
28	96432
29	92653
30	125616
31	113551
32	144192
33	147297
34	168656
35	170947
36	220320
37	194581
38	236608
39	244759

[1, 16, 67, 192, 373, 768, 1111, 1904, 2601, 3872, 4651, 7280, 7837, 11056, 13215, 17024, 18001, 25488, 25363, 34624, 37093, 44576, 45607, 63440, 60345, 74368, 79803, 96432, 92653, 125616, 113551, 144192, 147297, 168656, 170947, 220320, 194581, 236608, 244759]

cp's OEIS Frontend

A344600 a(n) = Sum_{k=1..n} phi(k) * (floor(n/k)^4 - floor((n-1)/k)^4).

Table of values

List of values