A372639 - cp's OEIS frontend

A372639 a(n) = (1/4) * Sum_{k=1..n} phi(10*k).

n	a(n)
1	1
2	3
3	5
4	9
5	14
6	18
7	24
8	32
9	38
10	48
11	58
12	66
13	78
14	90
15	100
16	116
17	132
18	144
19	162
20	182
21	194
22	214
23	236
24	252
25	277
26	301
27	319
28	343
29	371
30	391
31	421
32	453
33	473
34	505
35	535
36	559
37	595
38	631
39	655
40	695
41	735
42	759
43	801
44	841
45	871
46	915
47	961
48	993
49	1035
50	1085
51	1117
52	1165
53	1217
54	1253
55	1303

[1, 3, 5, 9, 14, 18, 24, 32, 38, 48, 58, 66, 78, 90, 100, 116, 132, 144, 162, 182, 194, 214, 236, 252, 277, 301, 319, 343, 371, 391, 421, 453, 473, 505, 535, 559, 595, 631, 655, 695, 735, 759, 801, 841, 871, 915, 961, 993, 1035, 1085, 1117, 1165, 1217, 1253, 1303]

cp's OEIS Frontend

A372639 a(n) = (1/4) * Sum_{k=1..n} phi(10*k).

Table of values

List of values