A246378 - cp's OEIS frontend

A246378 Permutation of natural numbers: a(1) = 1, a(2n) = nthcomposite(a(n)), a(2n+1) = nthprime(a(n)), where nthcomposite = A002808, nthprime = A000040.

n	a(n)
1	1
2	4
3	2
4	9
5	7
6	6
7	3
8	16
9	23
10	14
11	17
12	12
13	13
14	8
15	5
16	26
17	53
18	35
19	83
20	24
21	43
22	27
23	59
24	21
25	37
26	22
27	41
28	15
29	19
30	10
31	11
32	39
33	101
34	75
35	241
36	51
37	149
38	114
39	431
40	36
41	89
42	62
43	191
44	40
45	103
46	82
47	277
48	33
49	73
50	54
51	157
52	34
53	79
54	58
55	179
56	25
57	47
58	30
59	67
60	18
61	29
62	20
63	31
64	56
65	167
66	134
67	547
68	102
69	379
70	304
71	1523
72	72
73	233

[1, 4, 2, 9, 7, 6, 3, 16, 23, 14, 17, 12, 13, 8, 5, 26, 53, 35, 83, 24, 43, 27, 59, 21, 37, 22, 41, 15, 19, 10, 11, 39, 101, 75, 241, 51, 149, 114, 431, 36, 89, 62, 191, 40, 103, 82, 277, 33, 73, 54, 157, 34, 79, 58, 179, 25, 47, 30, 67, 18, 29, 20, 31, 56, 167, 134, 547, 102, 379, 304, 1523, 72, 233]

cp's OEIS Frontend

A246378 Permutation of natural numbers: a(1) = 1, a(2n) = nthcomposite(a(n)), a(2n+1) = nthprime(a(n)), where nthcomposite = A002808, nthprime = A000040.

Table of values

List of values