A372637 - cp's OEIS frontend

A372637 a(n) = (1/2) * Sum_{k=1..n} phi(6*k).

n	a(n)
1	1
2	3
3	6
4	10
5	14
6	20
7	26
8	34
9	43
10	51
11	61
12	73
13	85
14	97
15	109
16	125
17	141
18	159
19	177
20	193
21	211
22	231
23	253
24	277
25	297
26	321
27	348
28	372
29	400
30	424
31	454
32	486
33	516
34	548
35	572
36	608
37	644
38	680
39	716
40	748
41	788
42	824
43	866
44	906
45	942
46	986
47	1032
48	1080
49	1122
50	1162
51	1210
52	1258
53	1310
54	1364
55	1404

[1, 3, 6, 10, 14, 20, 26, 34, 43, 51, 61, 73, 85, 97, 109, 125, 141, 159, 177, 193, 211, 231, 253, 277, 297, 321, 348, 372, 400, 424, 454, 486, 516, 548, 572, 608, 644, 680, 716, 748, 788, 824, 866, 906, 942, 986, 1032, 1080, 1122, 1162, 1210, 1258, 1310, 1364, 1404]

cp's OEIS Frontend

A372637 a(n) = (1/2) * Sum_{k=1..n} phi(6*k).

Table of values

List of values