A280987 - cp's OEIS frontend

A280987 {Concatenation n, n-1, n-2, ...3,2,1} mod sigma(n).

n	a(n)
1	0
2	0
3	1
4	2
5	3
6	9
7	1
8	6
9	4
10	1
11	9
12	21
13	1
14	9
15	9
16	16
17	9
18	24
19	1
20	33
21	17
22	1
23	9
24	21
25	0
26	9
27	1
28	41
29	21
30	33
31	17
32	6
33	33
34	19
35	33
36	25
37	25
38	21
39	1
40	1
41	33
42	81
43	17
44	21
45	45
46	1
47	33
48	85
49	49
50	69
51	57
52	77
53	27
54	81
55	1
56	81
57	1
58	1
59	21
60	57
61	59
62	81
63	33
64	60
65	21
66	33
67	45
68	51
69	81
70	1
71	9
72	66
73	41
74	9
75	97
76	1
77	81
78	81
79	1
80	57
81	117
82	73
83	33
84	145

[0, 0, 1, 2, 3, 9, 1, 6, 4, 1, 9, 21, 1, 9, 9, 16, 9, 24, 1, 33, 17, 1, 9, 21, 0, 9, 1, 41, 21, 33, 17, 6, 33, 19, 33, 25, 25, 21, 1, 1, 33, 81, 17, 21, 45, 1, 33, 85, 49, 69, 57, 77, 27, 81, 1, 81, 1, 1, 21, 57, 59, 81, 33, 60, 21, 33, 45, 51, 81, 1, 9, 66, 41, 9, 97, 1, 81, 81, 1, 57, 117, 73, 33, 145]

cp's OEIS Frontend

A280987 {Concatenation n, n-1, n-2, ...3,2,1} mod sigma(n).

Table of values

List of values

n	a(n)
1	0
2	0
3	1
4	2
5	3
6	9
7	1
8	6
9	4
10	1
11	9
12	21
13	1
14	9
15	9
16	16
17	9
18	24
19	1
20	33
21	17
22	1
23	9
24	21
25	0
26	9
27	1
28	41
29	21
30	33
31	17
32	6
33	33
34	19
35	33
36	25
37	25
38	21
39	1
40	1
41	33
42	81
43	17
44	21
45	45
46	1
47	33
48	85
49	49
50	69
51	57
52	77
53	27
54	81
55	1
56	81
57	1
58	1
59	21
60	57
61	59
62	81
63	33
64	60
65	21
66	33
67	45
68	51
69	81
70	1
71	9
72	66
73	41
74	9
75	97
76	1
77	81
78	81
79	1
80	57
81	117
82	73
83	33
84	145

n	a(n)
1	0
2	0
3	1
4	2
5	3
6	9
7	1
8	6
9	4
10	1
11	9
12	21
13	1
14	9
15	9
16	16
17	9
18	24
19	1
20	33
21	17
22	1
23	9
24	21
25	0
26	9
27	1
28	41
29	21
30	33
31	17
32	6
33	33
34	19
35	33
36	25
37	25
38	21
39	1
40	1
41	33
42	81
43	17
44	21
45	45
46	1
47	33
48	85
49	49
50	69
51	57
52	77
53	27
54	81
55	1
56	81
57	1
58	1
59	21
60	57
61	59
62	81
63	33
64	60
65	21
66	33
67	45
68	51
69	81
70	1
71	9
72	66
73	41
74	9
75	97
76	1
77	81
78	81
79	1
80	57
81	117
82	73
83	33
84	145

n	a(n)
1	0
2	0
3	1
4	2
5	3
6	9
7	1
8	6
9	4
10	1
11	9
12	21
13	1
14	9
15	9
16	16
17	9
18	24
19	1
20	33
21	17
22	1
23	9
24	21
25	0
26	9
27	1
28	41
29	21
30	33
31	17
32	6
33	33
34	19
35	33
36	25
37	25
38	21
39	1
40	1
41	33
42	81
43	17
44	21
45	45
46	1
47	33
48	85
49	49
50	69
51	57
52	77
53	27
54	81
55	1
56	81
57	1
58	1
59	21
60	57
61	59
62	81
63	33
64	60
65	21
66	33
67	45
68	51
69	81
70	1
71	9
72	66
73	41
74	9
75	97
76	1
77	81
78	81
79	1
80	57
81	117
82	73
83	33
84	145