A246380 - cp's OEIS frontend

A246380 Permutation of natural numbers: a(1) = 1, a(2n) = nthcomposite(a(n)), a(2n-1) = nthprime(a(A064989(2n-1)-1)), where nthprime = A000040, nthcomposite = A002808, and A064989(n) shifts the prime factorization of n one step towards smaller primes.

n	a(n)
1	1
2	4
3	2
4	9
5	7
6	6
7	23
8	16
9	3
10	14
11	13
12	12
13	43
14	35
15	17
16	26
17	37
18	8
19	101
20	24
21	5
22	22
23	19
24	21
25	53
26	62
27	83
28	51
29	79
30	27
31	233
32	39
33	191
34	54
35	149
36	15
37	103
38	134
39	11
40	36
41	47
42	10
43	151
44	34
45	41
46	30
47	29
48	33
49	73
50	75
51	241
52	86
53	113
54	114
55	89
56	72
57	1153
58	108
59	443
60	40
61	593
62	296
63	547
64	56
65	167
66	245
67	173
68	76
69	563
70	194
71	1553
72	25

[1, 4, 2, 9, 7, 6, 23, 16, 3, 14, 13, 12, 43, 35, 17, 26, 37, 8, 101, 24, 5, 22, 19, 21, 53, 62, 83, 51, 79, 27, 233, 39, 191, 54, 149, 15, 103, 134, 11, 36, 47, 10, 151, 34, 41, 30, 29, 33, 73, 75, 241, 86, 113, 114, 89, 72, 1153, 108, 443, 40, 593, 296, 547, 56, 167, 245, 173, 76, 563, 194, 1553, 25]

cp's OEIS Frontend

A246380 Permutation of natural numbers: a(1) = 1, a(2n) = nthcomposite(a(n)), a(2n-1) = nthprime(a(A064989(2n-1)-1)), where nthprime = A000040, nthcomposite = A002808, and A064989(n) shifts the prime factorization of n one step towards smaller primes.

Table of values

List of values