A220949 - cp's OEIS frontend

A220949 Least prime p such that sum_{k=0}^n (2k+1)*x^(n-k) is irreducible modulo p.

n	a(n)
1	2
2	2
3	3
4	2
5	5
6	3
7	71
8	23
9	11
10	2
11	5
12	2
13	13
14	23
15	47
16	47
17	269
18	2
19	7
20	19
21	53
22	101
23	7
24	53
25	113
26	11
27	23
28	2
29	43
30	347
31	53
32	283
33	191
34	17
35	41
36	2
37	239
38	677
39	3
40	281
41	37
42	641
43	613
44	41
45	17
46	269
47	181
48	137
49	383
50	41
51	127
52	2
53	71
54	739
55	71
56	353
57	59
58	2
59	83
60	2

[2, 2, 3, 2, 5, 3, 71, 23, 11, 2, 5, 2, 13, 23, 47, 47, 269, 2, 7, 19, 53, 101, 7, 53, 113, 11, 23, 2, 43, 347, 53, 283, 191, 17, 41, 2, 239, 677, 3, 281, 37, 641, 613, 41, 17, 269, 181, 137, 383, 41, 127, 2, 71, 739, 71, 353, 59, 2, 83, 2]

cp's OEIS Frontend

A220949 Least prime p such that sum_{k=0}^n (2k+1)*x^(n-k) is irreducible modulo p.

Table of values

List of values

n	a(n)
1	2
2	2
3	3
4	2
5	5
6	3
7	71
8	23
9	11
10	2
11	5
12	2
13	13
14	23
15	47
16	47
17	269
18	2
19	7
20	19
21	53
22	101
23	7
24	53
25	113
26	11
27	23
28	2
29	43
30	347
31	53
32	283
33	191
34	17
35	41
36	2
37	239
38	677
39	3
40	281
41	37
42	641
43	613
44	41
45	17
46	269
47	181
48	137
49	383
50	41
51	127
52	2
53	71
54	739
55	71
56	353
57	59
58	2
59	83
60	2

n	a(n)
1	2
2	2
3	3
4	2
5	5
6	3
7	71
8	23
9	11
10	2
11	5
12	2
13	13
14	23
15	47
16	47
17	269
18	2
19	7
20	19
21	53
22	101
23	7
24	53
25	113
26	11
27	23
28	2
29	43
30	347
31	53
32	283
33	191
34	17
35	41
36	2
37	239
38	677
39	3
40	281
41	37
42	641
43	613
44	41
45	17
46	269
47	181
48	137
49	383
50	41
51	127
52	2
53	71
54	739
55	71
56	353
57	59
58	2
59	83
60	2

n	a(n)
1	2
2	2
3	3
4	2
5	5
6	3
7	71
8	23
9	11
10	2
11	5
12	2
13	13
14	23
15	47
16	47
17	269
18	2
19	7
20	19
21	53
22	101
23	7
24	53
25	113
26	11
27	23
28	2
29	43
30	347
31	53
32	283
33	191
34	17
35	41
36	2
37	239
38	677
39	3
40	281
41	37
42	641
43	613
44	41
45	17
46	269
47	181
48	137
49	383
50	41
51	127
52	2
53	71
54	739
55	71
56	353
57	59
58	2
59	83
60	2