A266638 - cp's OEIS frontend

A266638 a(1) = 1, a(ludic(n)) = (ludic(3+a(n-1))-1)/2, a(nonludic(n)) = A266410(a(n)), where ludic(n) = n-th ludic number A003309, nonludic(n) = n-th nonludic number A192607 and A266410 = numbers n such that 2n+1 is nonludic.

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	7
7	6
8	9
9	10
10	13
11	8
12	16
13	12
14	15
15	19
16	22
17	11
18	27
19	17
20	31
21	25
22	29
23	18
24	36
25	20
26	40
27	24
28	49
29	26
30	32
31	54
32	46
33	51
34	34
35	62
36	37
37	14
38	68
39	43
40	81
41	35
42	47
43	23
44	55
45	88
46	76
47	33
48	83
49	58
50	99
51	64
52	28
53	44
54	107
55	72
56	127
57	61
58	77
59	42
60	91
61	53
62	136
63	121
64	56
65	130
66	94
67	21
68	151
69	101
70	50
71	65
72	73
73	161
74	114
75	189
76	98
77	38

[1, 2, 3, 4, 5, 7, 6, 9, 10, 13, 8, 16, 12, 15, 19, 22, 11, 27, 17, 31, 25, 29, 18, 36, 20, 40, 24, 49, 26, 32, 54, 46, 51, 34, 62, 37, 14, 68, 43, 81, 35, 47, 23, 55, 88, 76, 33, 83, 58, 99, 64, 28, 44, 107, 72, 127, 61, 77, 42, 91, 53, 136, 121, 56, 130, 94, 21, 151, 101, 50, 65, 73, 161, 114, 189, 98, 38]

cp's OEIS Frontend

A266638 a(1) = 1, a(ludic(n)) = (ludic(3+a(n-1))-1)/2, a(nonludic(n)) = A266410(a(n)), where ludic(n) = n-th ludic number A003309, nonludic(n) = n-th nonludic number A192607 and A266410 = numbers n such that 2n+1 is nonludic.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	7
7	6
8	9
9	10
10	13
11	8
12	16
13	12
14	15
15	19
16	22
17	11
18	27
19	17
20	31
21	25
22	29
23	18
24	36
25	20
26	40
27	24
28	49
29	26
30	32
31	54
32	46
33	51
34	34
35	62
36	37
37	14
38	68
39	43
40	81
41	35
42	47
43	23
44	55
45	88
46	76
47	33
48	83
49	58
50	99
51	64
52	28
53	44
54	107
55	72
56	127
57	61
58	77
59	42
60	91
61	53
62	136
63	121
64	56
65	130
66	94
67	21
68	151
69	101
70	50
71	65
72	73
73	161
74	114
75	189
76	98
77	38

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	7
7	6
8	9
9	10
10	13
11	8
12	16
13	12
14	15
15	19
16	22
17	11
18	27
19	17
20	31
21	25
22	29
23	18
24	36
25	20
26	40
27	24
28	49
29	26
30	32
31	54
32	46
33	51
34	34
35	62
36	37
37	14
38	68
39	43
40	81
41	35
42	47
43	23
44	55
45	88
46	76
47	33
48	83
49	58
50	99
51	64
52	28
53	44
54	107
55	72
56	127
57	61
58	77
59	42
60	91
61	53
62	136
63	121
64	56
65	130
66	94
67	21
68	151
69	101
70	50
71	65
72	73
73	161
74	114
75	189
76	98
77	38

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	7
7	6
8	9
9	10
10	13
11	8
12	16
13	12
14	15
15	19
16	22
17	11
18	27
19	17
20	31
21	25
22	29
23	18
24	36
25	20
26	40
27	24
28	49
29	26
30	32
31	54
32	46
33	51
34	34
35	62
36	37
37	14
38	68
39	43
40	81
41	35
42	47
43	23
44	55
45	88
46	76
47	33
48	83
49	58
50	99
51	64
52	28
53	44
54	107
55	72
56	127
57	61
58	77
59	42
60	91
61	53
62	136
63	121
64	56
65	130
66	94
67	21
68	151
69	101
70	50
71	65
72	73
73	161
74	114
75	189
76	98
77	38