A293703 - cp's OEIS frontend

A293703 a(n) is the length of the longest palindromic subsequence in the first differences of the list of the first n negative and positive roots of floor(tan(k))=1.

n	a(n)
1	1
2	3
3	5
4	7
5	9
6	11
7	13
8	15
9	15
10	17
11	17
12	19
13	19
14	21
15	21
16	23
17	23
18	25
19	27
20	29
21	31
22	33
23	35
24	37
25	39
26	41
27	43
28	45
29	47
30	49
31	51
32	53
33	55
34	57
35	59
36	61
37	63
38	65
39	67
40	69
41	71
42	73
43	75
44	77
45	79
46	81
47	83
48	85
49	87
50	89
51	91
52	93
53	95
54	97
55	99
56	101
57	103
58	105
59	107
60	109
61	111
62	113
63	115
64	117

[1, 3, 5, 7, 9, 11, 13, 15, 15, 17, 17, 19, 19, 21, 21, 23, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89, 91, 93, 95, 97, 99, 101, 103, 105, 107, 109, 111, 113, 115, 117]

cp's OEIS Frontend

A293703 a(n) is the length of the longest palindromic subsequence in the first differences of the list of the first n negative and positive roots of floor(tan(k))=1.

Table of values

List of values

n	a(n)
1	1
2	3
3	5
4	7
5	9
6	11
7	13
8	15
9	15
10	17
11	17
12	19
13	19
14	21
15	21
16	23
17	23
18	25
19	27
20	29
21	31
22	33
23	35
24	37
25	39
26	41
27	43
28	45
29	47
30	49
31	51
32	53
33	55
34	57
35	59
36	61
37	63
38	65
39	67
40	69
41	71
42	73
43	75
44	77
45	79
46	81
47	83
48	85
49	87
50	89
51	91
52	93
53	95
54	97
55	99
56	101
57	103
58	105
59	107
60	109
61	111
62	113
63	115
64	117

n	a(n)
1	1
2	3
3	5
4	7
5	9
6	11
7	13
8	15
9	15
10	17
11	17
12	19
13	19
14	21
15	21
16	23
17	23
18	25
19	27
20	29
21	31
22	33
23	35
24	37
25	39
26	41
27	43
28	45
29	47
30	49
31	51
32	53
33	55
34	57
35	59
36	61
37	63
38	65
39	67
40	69
41	71
42	73
43	75
44	77
45	79
46	81
47	83
48	85
49	87
50	89
51	91
52	93
53	95
54	97
55	99
56	101
57	103
58	105
59	107
60	109
61	111
62	113
63	115
64	117

n	a(n)
1	1
2	3
3	5
4	7
5	9
6	11
7	13
8	15
9	15
10	17
11	17
12	19
13	19
14	21
15	21
16	23
17	23
18	25
19	27
20	29
21	31
22	33
23	35
24	37
25	39
26	41
27	43
28	45
29	47
30	49
31	51
32	53
33	55
34	57
35	59
36	61
37	63
38	65
39	67
40	69
41	71
42	73
43	75
44	77
45	79
46	81
47	83
48	85
49	87
50	89
51	91
52	93
53	95
54	97
55	99
56	101
57	103
58	105
59	107
60	109
61	111
62	113
63	115
64	117