A099957 - cp's OEIS frontend

A099957 a(n) = Sum_{k=0..n-1} phi(2k+1).

n	a(n)
1	1
2	3
3	7
4	13
5	19
6	29
7	41
8	49
9	65
10	83
11	95
12	117
13	137
14	155
15	183
16	213
17	233
18	257
19	293
20	317
21	357
22	399
23	423
24	469
25	511
26	543
27	595
28	635
29	671
30	729
31	789
32	825
33	873
34	939
35	983
36	1053
37	1125
38	1165
39	1225
40	1303
41	1357
42	1439
43	1503
44	1559
45	1647
46	1719
47	1779
48	1851
49	1947

[1, 3, 7, 13, 19, 29, 41, 49, 65, 83, 95, 117, 137, 155, 183, 213, 233, 257, 293, 317, 357, 399, 423, 469, 511, 543, 595, 635, 671, 729, 789, 825, 873, 939, 983, 1053, 1125, 1165, 1225, 1303, 1357, 1439, 1503, 1559, 1647, 1719, 1779, 1851, 1947]

cp's OEIS Frontend

A099957 a(n) = Sum_{k=0..n-1} phi(2k+1).

Table of values

List of values