A380714 - cp's OEIS frontend

A380714 a(n) = n*(n-1) mod (10^m-1) where m is the number of decimal digits in n.

n	a(n)
1	0
2	2
3	6
4	3
5	2
6	3
7	6
8	2
9	0
10	90
11	11
12	33
13	57
14	83
15	12
16	42
17	74
18	9
19	45
20	83
21	24
22	66
23	11
24	57
25	6
26	56
27	9
28	63
29	20
30	78
31	39
32	2
33	66
34	33
35	2
36	72
37	45
38	20
39	96
40	75
41	56
42	39
43	24
44	11
45	0
46	90
47	83
48	78
49	75
50	74
51	75
52	78
53	83
54	90
55	0
56	11
57	24
58	39
59	56
60	75
61	96
62	20
63	45
64	72
65	2
66	33
67	66

[0, 2, 6, 3, 2, 3, 6, 2, 0, 90, 11, 33, 57, 83, 12, 42, 74, 9, 45, 83, 24, 66, 11, 57, 6, 56, 9, 63, 20, 78, 39, 2, 66, 33, 2, 72, 45, 20, 96, 75, 56, 39, 24, 11, 0, 90, 83, 78, 75, 74, 75, 78, 83, 90, 0, 11, 24, 39, 56, 75, 96, 20, 45, 72, 2, 33, 66]

cp's OEIS Frontend

A380714 a(n) = n*(n-1) mod (10^m-1) where m is the number of decimal digits in n.

Table of values

List of values

n	a(n)
1	0
2	2
3	6
4	3
5	2
6	3
7	6
8	2
9	0
10	90
11	11
12	33
13	57
14	83
15	12
16	42
17	74
18	9
19	45
20	83
21	24
22	66
23	11
24	57
25	6
26	56
27	9
28	63
29	20
30	78
31	39
32	2
33	66
34	33
35	2
36	72
37	45
38	20
39	96
40	75
41	56
42	39
43	24
44	11
45	0
46	90
47	83
48	78
49	75
50	74
51	75
52	78
53	83
54	90
55	0
56	11
57	24
58	39
59	56
60	75
61	96
62	20
63	45
64	72
65	2
66	33
67	66

n	a(n)
1	0
2	2
3	6
4	3
5	2
6	3
7	6
8	2
9	0
10	90
11	11
12	33
13	57
14	83
15	12
16	42
17	74
18	9
19	45
20	83
21	24
22	66
23	11
24	57
25	6
26	56
27	9
28	63
29	20
30	78
31	39
32	2
33	66
34	33
35	2
36	72
37	45
38	20
39	96
40	75
41	56
42	39
43	24
44	11
45	0
46	90
47	83
48	78
49	75
50	74
51	75
52	78
53	83
54	90
55	0
56	11
57	24
58	39
59	56
60	75
61	96
62	20
63	45
64	72
65	2
66	33
67	66

n	a(n)
1	0
2	2
3	6
4	3
5	2
6	3
7	6
8	2
9	0
10	90
11	11
12	33
13	57
14	83
15	12
16	42
17	74
18	9
19	45
20	83
21	24
22	66
23	11
24	57
25	6
26	56
27	9
28	63
29	20
30	78
31	39
32	2
33	66
34	33
35	2
36	72
37	45
38	20
39	96
40	75
41	56
42	39
43	24
44	11
45	0
46	90
47	83
48	78
49	75
50	74
51	75
52	78
53	83
54	90
55	0
56	11
57	24
58	39
59	56
60	75
61	96
62	20
63	45
64	72
65	2
66	33
67	66