A374352 - cp's OEIS frontend

A374352 a(n) = [n>1] * a(n-1) + Sum_{d|n} phi(lcm(d,n/d)) where [] is an Iverson bracket.

n	a(n)
1	1
2	3
3	7
4	12
5	20
6	28
7	40
8	52
9	66
10	82
11	102
12	122
13	146
14	170
15	202
16	228
17	260
18	288
19	324
20	364
21	412
22	452
23	496
24	544
25	588
26	636
27	684
28	744
29	800
30	864
31	924
32	980
33	1060
34	1124
35	1220
36	1290
37	1362
38	1434
39	1530
40	1626
41	1706
42	1802
43	1886
44	1986
45	2098
46	2186
47	2278
48	2382
49	2472
50	2560
51	2688

[1, 3, 7, 12, 20, 28, 40, 52, 66, 82, 102, 122, 146, 170, 202, 228, 260, 288, 324, 364, 412, 452, 496, 544, 588, 636, 684, 744, 800, 864, 924, 980, 1060, 1124, 1220, 1290, 1362, 1434, 1530, 1626, 1706, 1802, 1886, 1986, 2098, 2186, 2278, 2382, 2472, 2560, 2688]

cp's OEIS Frontend

A374352 a(n) = [n>1] * a(n-1) + Sum_{d|n} phi(lcm(d,n/d)) where [] is an Iverson bracket.

Table of values

List of values