A055033 - cp's OEIS frontend

A055033 a(n) = usigma(usigma(n)), where usigma(n) is the sum of unitary divisors of n (A034448).

n	a(n)
1	1
2	4
3	5
4	6
5	12
6	20
7	9
8	10
9	18
10	30
11	20
12	30
13	24
14	36
15	36
16	18
17	30
18	72
19	30
20	72
21	33
22	50
23	36
24	50
25	42
26	96
27	40
28	54
29	72
30	90
31	33
32	48
33	68
34	84
35	68
36	78
37	60
38	120
39	72
40	84
41	96
42	132
43	60
44	120
45	120
46	90
47	68
48	90
49	78
50	168
51	90
52	144
53	84
54	160
55	90
56	90
57	102
58	180
59	120
60	216
61	96

[1, 4, 5, 6, 12, 20, 9, 10, 18, 30, 20, 30, 24, 36, 36, 18, 30, 72, 30, 72, 33, 50, 36, 50, 42, 96, 40, 54, 72, 90, 33, 48, 68, 84, 68, 78, 60, 120, 72, 84, 96, 132, 60, 120, 120, 90, 68, 90, 78, 168, 90, 144, 84, 160, 90, 90, 102, 180, 120, 216, 96]

cp's OEIS Frontend

A055033 a(n) = usigma(usigma(n)), where usigma(n) is the sum of unitary divisors of n (A034448).

Table of values

List of values

n	a(n)
1	1
2	4
3	5
4	6
5	12
6	20
7	9
8	10
9	18
10	30
11	20
12	30
13	24
14	36
15	36
16	18
17	30
18	72
19	30
20	72
21	33
22	50
23	36
24	50
25	42
26	96
27	40
28	54
29	72
30	90
31	33
32	48
33	68
34	84
35	68
36	78
37	60
38	120
39	72
40	84
41	96
42	132
43	60
44	120
45	120
46	90
47	68
48	90
49	78
50	168
51	90
52	144
53	84
54	160
55	90
56	90
57	102
58	180
59	120
60	216
61	96

n	a(n)
1	1
2	4
3	5
4	6
5	12
6	20
7	9
8	10
9	18
10	30
11	20
12	30
13	24
14	36
15	36
16	18
17	30
18	72
19	30
20	72
21	33
22	50
23	36
24	50
25	42
26	96
27	40
28	54
29	72
30	90
31	33
32	48
33	68
34	84
35	68
36	78
37	60
38	120
39	72
40	84
41	96
42	132
43	60
44	120
45	120
46	90
47	68
48	90
49	78
50	168
51	90
52	144
53	84
54	160
55	90
56	90
57	102
58	180
59	120
60	216
61	96

n	a(n)
1	1
2	4
3	5
4	6
5	12
6	20
7	9
8	10
9	18
10	30
11	20
12	30
13	24
14	36
15	36
16	18
17	30
18	72
19	30
20	72
21	33
22	50
23	36
24	50
25	42
26	96
27	40
28	54
29	72
30	90
31	33
32	48
33	68
34	84
35	68
36	78
37	60
38	120
39	72
40	84
41	96
42	132
43	60
44	120
45	120
46	90
47	68
48	90
49	78
50	168
51	90
52	144
53	84
54	160
55	90
56	90
57	102
58	180
59	120
60	216
61	96