A257802 - cp's OEIS frontend

A257802 Permutation of natural numbers: a(1) = 1, a(lucky(n)) = oddprime(a(n-1)), a(unlucky(n)) = not_an_oddprime(1+a(n)).

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	8
7	5
8	10
9	7
10	14
11	9
12	16
13	11
14	12
15	17
16	22
17	15
18	25
19	18
20	20
21	23
22	26
23	33
24	24
25	13
26	36
27	27
28	30
29	34
30	38
31	31
32	48
33	19
34	35
35	21
36	51
37	47
38	39
39	44
40	49
41	54
42	45
43	29
44	66
45	28
46	50
47	32
48	70
49	59
50	65
51	37
52	55
53	62
54	68
55	75
56	63
57	42
58	90
59	40
60	69
61	46
62	94
63	41
64	81
65	88
66	52
67	61
68	76
69	83
70	85
71	92
72	100
73	53
74	86
75	101
76	58
77	120
78	56
79	67
80	93
81	64

[1, 2, 3, 4, 6, 8, 5, 10, 7, 14, 9, 16, 11, 12, 17, 22, 15, 25, 18, 20, 23, 26, 33, 24, 13, 36, 27, 30, 34, 38, 31, 48, 19, 35, 21, 51, 47, 39, 44, 49, 54, 45, 29, 66, 28, 50, 32, 70, 59, 65, 37, 55, 62, 68, 75, 63, 42, 90, 40, 69, 46, 94, 41, 81, 88, 52, 61, 76, 83, 85, 92, 100, 53, 86, 101, 58, 120, 56, 67, 93, 64]

cp's OEIS Frontend

A257802 Permutation of natural numbers: a(1) = 1, a(lucky(n)) = oddprime(a(n-1)), a(unlucky(n)) = not_an_oddprime(1+a(n)).

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	8
7	5
8	10
9	7
10	14
11	9
12	16
13	11
14	12
15	17
16	22
17	15
18	25
19	18
20	20
21	23
22	26
23	33
24	24
25	13
26	36
27	27
28	30
29	34
30	38
31	31
32	48
33	19
34	35
35	21
36	51
37	47
38	39
39	44
40	49
41	54
42	45
43	29
44	66
45	28
46	50
47	32
48	70
49	59
50	65
51	37
52	55
53	62
54	68
55	75
56	63
57	42
58	90
59	40
60	69
61	46
62	94
63	41
64	81
65	88
66	52
67	61
68	76
69	83
70	85
71	92
72	100
73	53
74	86
75	101
76	58
77	120
78	56
79	67
80	93
81	64

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	8
7	5
8	10
9	7
10	14
11	9
12	16
13	11
14	12
15	17
16	22
17	15
18	25
19	18
20	20
21	23
22	26
23	33
24	24
25	13
26	36
27	27
28	30
29	34
30	38
31	31
32	48
33	19
34	35
35	21
36	51
37	47
38	39
39	44
40	49
41	54
42	45
43	29
44	66
45	28
46	50
47	32
48	70
49	59
50	65
51	37
52	55
53	62
54	68
55	75
56	63
57	42
58	90
59	40
60	69
61	46
62	94
63	41
64	81
65	88
66	52
67	61
68	76
69	83
70	85
71	92
72	100
73	53
74	86
75	101
76	58
77	120
78	56
79	67
80	93
81	64

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	8
7	5
8	10
9	7
10	14
11	9
12	16
13	11
14	12
15	17
16	22
17	15
18	25
19	18
20	20
21	23
22	26
23	33
24	24
25	13
26	36
27	27
28	30
29	34
30	38
31	31
32	48
33	19
34	35
35	21
36	51
37	47
38	39
39	44
40	49
41	54
42	45
43	29
44	66
45	28
46	50
47	32
48	70
49	59
50	65
51	37
52	55
53	62
54	68
55	75
56	63
57	42
58	90
59	40
60	69
61	46
62	94
63	41
64	81
65	88
66	52
67	61
68	76
69	83
70	85
71	92
72	100
73	53
74	86
75	101
76	58
77	120
78	56
79	67
80	93
81	64