A246682 - cp's OEIS frontend

A246682 Permutation of natural numbers: a(1) = 0, a(2) = 1, and for n > 1, a(2n) = nthcomposite(a(n)), a(2n-1) = nthprime(a(A064989(2n-1))), where nthprime = A000040, nthcomposite = A002808, and A064989(n) shifts the prime factorization of n one step towards smaller primes.

n	a(n)
1	0
2	1
3	2
4	4
5	3
6	6
7	5
8	9
9	7
10	8
11	11
12	12
13	31
14	10
15	13
16	16
17	127
18	14
19	709
20	15
21	19
22	20
23	5381
24	21
25	17
26	46
27	23
28	18
29	52711
30	22
31	648391
32	26
33	29
34	166
35	41
36	24
37	9737333
38	858
39	71
40	25
41	174440041
42	30
43	3657500101
44	32
45	37
46	6186

[0, 1, 2, 4, 3, 6, 5, 9, 7, 8, 11, 12, 31, 10, 13, 16, 127, 14, 709, 15, 19, 20, 5381, 21, 17, 46, 23, 18, 52711, 22, 648391, 26, 29, 166, 41, 24, 9737333, 858, 71, 25, 174440041, 30, 3657500101, 32, 37, 6186]

cp's OEIS Frontend

A246682 Permutation of natural numbers: a(1) = 0, a(2) = 1, and for n > 1, a(2n) = nthcomposite(a(n)), a(2n-1) = nthprime(a(A064989(2n-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