A124823 - cp's OEIS frontend

A124823 a(n) = n-th integer from among those positive integers which are coprime to n(n+1)/2.

n	a(n)
1	1
2	2
3	7
4	9
5	8
6	10
7	15
8	23
9	16
10	13
11	35
12	37
13	16
14	31
15	53
16	33
17	26
18	28
19	49
20	83
21	40
22	25
23	71
24	89
25	33
26	41
27	95
28	67
29	56
30	58
31	63
32	103
33	58
34	53
35	151
36	109
37	40
38	64
39	157
40	101
41	73
42	74
43	95
44	179
45	88
46	49
47	143
48	167
49	71
50	98
51	175
52	113
53	80
54	109
55	173
56	199
57	92
58	61
59	223
60	227
61	64
62	110
63	221
64	173
65	142

[1, 2, 7, 9, 8, 10, 15, 23, 16, 13, 35, 37, 16, 31, 53, 33, 26, 28, 49, 83, 40, 25, 71, 89, 33, 41, 95, 67, 56, 58, 63, 103, 58, 53, 151, 109, 40, 64, 157, 101, 73, 74, 95, 179, 88, 49, 143, 167, 71, 98, 175, 113, 80, 109, 173, 199, 92, 61, 223, 227, 64, 110, 221, 173, 142]

cp's OEIS Frontend

A124823 a(n) = n-th integer from among those positive integers which are coprime to n(n+1)/2.

Table of values

List of values

n	a(n)
1	1
2	2
3	7
4	9
5	8
6	10
7	15
8	23
9	16
10	13
11	35
12	37
13	16
14	31
15	53
16	33
17	26
18	28
19	49
20	83
21	40
22	25
23	71
24	89
25	33
26	41
27	95
28	67
29	56
30	58
31	63
32	103
33	58
34	53
35	151
36	109
37	40
38	64
39	157
40	101
41	73
42	74
43	95
44	179
45	88
46	49
47	143
48	167
49	71
50	98
51	175
52	113
53	80
54	109
55	173
56	199
57	92
58	61
59	223
60	227
61	64
62	110
63	221
64	173
65	142

n	a(n)
1	1
2	2
3	7
4	9
5	8
6	10
7	15
8	23
9	16
10	13
11	35
12	37
13	16
14	31
15	53
16	33
17	26
18	28
19	49
20	83
21	40
22	25
23	71
24	89
25	33
26	41
27	95
28	67
29	56
30	58
31	63
32	103
33	58
34	53
35	151
36	109
37	40
38	64
39	157
40	101
41	73
42	74
43	95
44	179
45	88
46	49
47	143
48	167
49	71
50	98
51	175
52	113
53	80
54	109
55	173
56	199
57	92
58	61
59	223
60	227
61	64
62	110
63	221
64	173
65	142

n	a(n)
1	1
2	2
3	7
4	9
5	8
6	10
7	15
8	23
9	16
10	13
11	35
12	37
13	16
14	31
15	53
16	33
17	26
18	28
19	49
20	83
21	40
22	25
23	71
24	89
25	33
26	41
27	95
28	67
29	56
30	58
31	63
32	103
33	58
34	53
35	151
36	109
37	40
38	64
39	157
40	101
41	73
42	74
43	95
44	179
45	88
46	49
47	143
48	167
49	71
50	98
51	175
52	113
53	80
54	109
55	173
56	199
57	92
58	61
59	223
60	227
61	64
62	110
63	221
64	173
65	142