A305419 - cp's OEIS frontend

A305419 Largest k < n whose binary expansion encodes an irreducible (0,1)-polynomial over GF(2)[X], with a(1) = a(2) = 1.

n	a(n)
1	1
2	1
3	2
4	3
5	3
6	3
7	3
8	7
9	7
10	7
11	7
12	11
13	11
14	13
15	13
16	13
17	13
18	13
19	13
20	19
21	19
22	19
23	19
24	19
25	19
26	25
27	25
28	25
29	25
30	25
31	25
32	31
33	31
34	31
35	31
36	31
37	31
38	37
39	37
40	37
41	37
42	41
43	41
44	41
45	41
46	41
47	41
48	47
49	47
50	47
51	47
52	47
53	47
54	47
55	47
56	55
57	55
58	55
59	55
60	59
61	59
62	61
63	61
64	61
65	61
66	61
67	61
68	67
69	67
70	67
71	67
72	67
73	67
74	73
75	73
76	73
77	73
78	73
79	73
80	73
81	73
82	73
83	73
84	73
85	73
86	73
87	73
88	87

[1, 1, 2, 3, 3, 3, 3, 7, 7, 7, 7, 11, 11, 13, 13, 13, 13, 13, 13, 19, 19, 19, 19, 19, 19, 25, 25, 25, 25, 25, 25, 31, 31, 31, 31, 31, 31, 37, 37, 37, 37, 41, 41, 41, 41, 41, 41, 47, 47, 47, 47, 47, 47, 47, 47, 55, 55, 55, 55, 59, 59, 61, 61, 61, 61, 61, 61, 67, 67, 67, 67, 67, 67, 73, 73, 73, 73, 73, 73, 73, 73, 73, 73, 73, 73, 73, 73, 87]

cp's OEIS Frontend

A305419 Largest k < n whose binary expansion encodes an irreducible (0,1)-polynomial over GF(2)[X], with a(1) = a(2) = 1.

Table of values

List of values

n	a(n)
1	1
2	1
3	2
4	3
5	3
6	3
7	3
8	7
9	7
10	7
11	7
12	11
13	11
14	13
15	13
16	13
17	13
18	13
19	13
20	19
21	19
22	19
23	19
24	19
25	19
26	25
27	25
28	25
29	25
30	25
31	25
32	31
33	31
34	31
35	31
36	31
37	31
38	37
39	37
40	37
41	37
42	41
43	41
44	41
45	41
46	41
47	41
48	47
49	47
50	47
51	47
52	47
53	47
54	47
55	47
56	55
57	55
58	55
59	55
60	59
61	59
62	61
63	61
64	61
65	61
66	61
67	61
68	67
69	67
70	67
71	67
72	67
73	67
74	73
75	73
76	73
77	73
78	73
79	73
80	73
81	73
82	73
83	73
84	73
85	73
86	73
87	73
88	87

n	a(n)
1	1
2	1
3	2
4	3
5	3
6	3
7	3
8	7
9	7
10	7
11	7
12	11
13	11
14	13
15	13
16	13
17	13
18	13
19	13
20	19
21	19
22	19
23	19
24	19
25	19
26	25
27	25
28	25
29	25
30	25
31	25
32	31
33	31
34	31
35	31
36	31
37	31
38	37
39	37
40	37
41	37
42	41
43	41
44	41
45	41
46	41
47	41
48	47
49	47
50	47
51	47
52	47
53	47
54	47
55	47
56	55
57	55
58	55
59	55
60	59
61	59
62	61
63	61
64	61
65	61
66	61
67	61
68	67
69	67
70	67
71	67
72	67
73	67
74	73
75	73
76	73
77	73
78	73
79	73
80	73
81	73
82	73
83	73
84	73
85	73
86	73
87	73
88	87

n	a(n)
1	1
2	1
3	2
4	3
5	3
6	3
7	3
8	7
9	7
10	7
11	7
12	11
13	11
14	13
15	13
16	13
17	13
18	13
19	13
20	19
21	19
22	19
23	19
24	19
25	19
26	25
27	25
28	25
29	25
30	25
31	25
32	31
33	31
34	31
35	31
36	31
37	31
38	37
39	37
40	37
41	37
42	41
43	41
44	41
45	41
46	41
47	41
48	47
49	47
50	47
51	47
52	47
53	47
54	47
55	47
56	55
57	55
58	55
59	55
60	59
61	59
62	61
63	61
64	61
65	61
66	61
67	61
68	67
69	67
70	67
71	67
72	67
73	67
74	73
75	73
76	73
77	73
78	73
79	73
80	73
81	73
82	73
83	73
84	73
85	73
86	73
87	73
88	87