A091369 - cp's OEIS frontend

A091369 a(n) = Sum_{i=1..n} phi(i)*ceiling(n/i).

n	a(n)
1	1
2	3
3	7
4	12
5	20
6	27
7	39
8	50
9	64
10	77
11	97
12	112
13	136
14	155
15	177
16	200
17	232
18	255
19	291
20	318
21	350
22	381
23	425
24	456
25	500
26	537
27	581
28	620
29	676
30	713
31	773
32	820
33	872
34	921
35	979
36	1026
37	1098
38	1153
39	1215
40	1270
41	1350
42	1403
43	1487
44	1550
45	1618
46	1685
47	1777
48	1840
49	1930
50	1999
51	2081
52	2156

[1, 3, 7, 12, 20, 27, 39, 50, 64, 77, 97, 112, 136, 155, 177, 200, 232, 255, 291, 318, 350, 381, 425, 456, 500, 537, 581, 620, 676, 713, 773, 820, 872, 921, 979, 1026, 1098, 1153, 1215, 1270, 1350, 1403, 1487, 1550, 1618, 1685, 1777, 1840, 1930, 1999, 2081, 2156]

cp's OEIS Frontend

A091369 a(n) = Sum_{i=1..n} phi(i)*ceiling(n/i).

Table of values

List of values