A376149 - cp's OEIS frontend

A376149 Numbers a = +/- 1 such that a + b + c = d are abcd quadruples in the "abcd-conjecture" with a < b < c < d, all |a|, b, c, d are pairwise coprime, the quality q of the quadruple has q > 1, term b = A376144(n) and term c = A376143(n). Quadruples are sorted by c then b.

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

[-1, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, 1, 1, 1, -1, 1, -1, -1, -1, 1, 1, -1, 1, 1, -1, -1, -1, 1, 1, 1, 1, 1, 1, 1, -1, -1, 1, 1, 1, 1, 1, -1, 1, 1, 1, 1, -1, -1, 1, 1, 1, -1, -1, 1, 1, 1, 1, -1, -1, 1, 1, -1, 1, 1, -1, 1, -1, 1, 1, 1, -1, -1, 1, 1, 1, 1]

cp's OEIS Frontend

A376149 Numbers a = +/- 1 such that a + b + c = d are abcd quadruples in the "abcd-conjecture" with a < b < c < d, all |a|, b, c, d are pairwise coprime, the quality q of the quadruple has q > 1, term b = A376144(n) and term c = A376143(n). Quadruples are sorted by c then b.

Table of values

List of values

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

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

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