A375228 - cp's OEIS frontend

A375228 a(n) is the largest number k such that usigma(k) divides n where usigma(k) is the sum of unitary divisors of k (A034448).

n	a(n)
1	1
2	1
3	2
4	3
5	4
6	5
7	1
8	7
9	8
10	9
11	1
12	11
13	1
14	13
15	4
16	7
17	16
18	17
19	1
20	19
21	2
22	1
23	1
24	23
25	4
26	25
27	8
28	27
29	1
30	29
31	1
32	31
33	32
34	16
35	4
36	24
37	1
38	37
39	2
40	28
41	1
42	41
43	1
44	43
45	8
46	1
47	1
48	47
49	1
50	49
51	16
52	25
53	1
54	53
55	4
56	39
57	2
58	1
59	1
60	59
61	1
62	61
63	8
64	31
65	64
66	32
67	1
68	67
69	2
70	52
71	1
72	71
73	1
74	73
75	4
76	37

[1, 1, 2, 3, 4, 5, 1, 7, 8, 9, 1, 11, 1, 13, 4, 7, 16, 17, 1, 19, 2, 1, 1, 23, 4, 25, 8, 27, 1, 29, 1, 31, 32, 16, 4, 24, 1, 37, 2, 28, 1, 41, 1, 43, 8, 1, 1, 47, 1, 49, 16, 25, 1, 53, 4, 39, 2, 1, 1, 59, 1, 61, 8, 31, 64, 32, 1, 67, 2, 52, 1, 71, 1, 73, 4, 37]

cp's OEIS Frontend

A375228 a(n) is the largest number k such that usigma(k) divides n where usigma(k) is the sum of unitary divisors of k (A034448).

Table of values

List of values

n	a(n)
1	1
2	1
3	2
4	3
5	4
6	5
7	1
8	7
9	8
10	9
11	1
12	11
13	1
14	13
15	4
16	7
17	16
18	17
19	1
20	19
21	2
22	1
23	1
24	23
25	4
26	25
27	8
28	27
29	1
30	29
31	1
32	31
33	32
34	16
35	4
36	24
37	1
38	37
39	2
40	28
41	1
42	41
43	1
44	43
45	8
46	1
47	1
48	47
49	1
50	49
51	16
52	25
53	1
54	53
55	4
56	39
57	2
58	1
59	1
60	59
61	1
62	61
63	8
64	31
65	64
66	32
67	1
68	67
69	2
70	52
71	1
72	71
73	1
74	73
75	4
76	37

n	a(n)
1	1
2	1
3	2
4	3
5	4
6	5
7	1
8	7
9	8
10	9
11	1
12	11
13	1
14	13
15	4
16	7
17	16
18	17
19	1
20	19
21	2
22	1
23	1
24	23
25	4
26	25
27	8
28	27
29	1
30	29
31	1
32	31
33	32
34	16
35	4
36	24
37	1
38	37
39	2
40	28
41	1
42	41
43	1
44	43
45	8
46	1
47	1
48	47
49	1
50	49
51	16
52	25
53	1
54	53
55	4
56	39
57	2
58	1
59	1
60	59
61	1
62	61
63	8
64	31
65	64
66	32
67	1
68	67
69	2
70	52
71	1
72	71
73	1
74	73
75	4
76	37

n	a(n)
1	1
2	1
3	2
4	3
5	4
6	5
7	1
8	7
9	8
10	9
11	1
12	11
13	1
14	13
15	4
16	7
17	16
18	17
19	1
20	19
21	2
22	1
23	1
24	23
25	4
26	25
27	8
28	27
29	1
30	29
31	1
32	31
33	32
34	16
35	4
36	24
37	1
38	37
39	2
40	28
41	1
42	41
43	1
44	43
45	8
46	1
47	1
48	47
49	1
50	49
51	16
52	25
53	1
54	53
55	4
56	39
57	2
58	1
59	1
60	59
61	1
62	61
63	8
64	31
65	64
66	32
67	1
68	67
69	2
70	52
71	1
72	71
73	1
74	73
75	4
76	37