A139642 - cp's OEIS frontend

A139642 Irregular triangle where row n gives the congruence (mod 4N) for the primes represented by the quadratic form x^2+Ny^2, where N=A000926(n) is a convenient number.

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

[1, 2, 1, 2, 3, 1, 3, 7, 1, 5, 9, 13, 1, 5, 9, 1, 7, 1, 7, 9, 11, 15, 23, 25, 1, 9, 17, 25, 1, 13, 25, 1, 9, 11, 19, 1, 13, 25, 37, 1, 9, 13, 17, 25, 29, 49, 1, 19, 31, 49, 1, 9, 17, 25, 33, 41, 49, 57, 1, 19, 25, 43, 49, 67, 1, 25, 37, 1, 9, 15, 23, 25, 31, 47, 49, 71, 81, 1, 25, 49, 73, 1, 9]

cp's OEIS Frontend

A139642 Irregular triangle where row n gives the congruence (mod 4N) for the primes represented by the quadratic form x^2+Ny^2, where N=A000926(n) is a convenient number.

Table of values

List of values

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

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

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