A007388 - OEIS

A007388 as a simple table

n	a(n)
1	0
2	2
3	3
4	2
5	5
6	2
7	7
8	2
9	9
10	2
11	11
12	2
13	13
14	9
15	15
16	18
17	17
18	29
19	19
20	42
21	28
22	57
23	46
24	74
25	75
26	93
27	117
28	121
29	174
30	167
31	248
32	242
33	341
34	359
35	462
36	533
37	629
38	781
39	871
40	1122
41	1230
42	1584
43	1763
44	2213
45	2544
46	3084
47	3666
48	4314
49	5250
50	6077
51	7463
52	8621
53	10547

[0,2,3,2,5,2,7,2,9,2,11,2,13,9,15,18,17,29,19,42, 28,57,46,74,75,93,117,121,174,167,248,242,341,359, 462,533,629,781,871,1122,1230,1584,1763,2213,2544, 3084,3666,4314,5250,6077,7463,8621,10547]