A354196 - cp's OEIS frontend

A354196 a(n) = A064989(A064989(sigma(sigma(A003961(A003961(n)))))), where A003961 shifts the prime factorization of n one step towards larger primes, and A064989 shifts it back towards smaller primes.

n	a(n)
1	1
2	1
3	2
4	1
5	3
6	23
7	1
8	9
9	2
10	14
11	7
12	2
13	3
14	3
15	3
16	1
17	2
18	14
19	1
20	3
21	23
22	6
23	3
24	9
25	2
26	2
27	529
28	1
29	2
30	763
31	1
32	7
33	161
34	161
35	2
36	2
37	3
38	21
39	3
40	483
41	23
42	3
43	2
44	7
45	42
46	109
47	3
48	2
49	23
50	2
51	109
52	3
53	1
54	69
55	4
56	6
57	23
58	6
59	3
60	3
61	14
62	21
63	2
64	3133
65	23
66	6
67	13
68	2
69	201
70	161
71	23
72	126
73	3
74	2
75	4
76	1
77	21
78	109
79	7
80	3
81	461
82	21
83	13
84	23
85	21
86	75
87	46
88	12
89	1
90	8

[1, 1, 2, 1, 3, 23, 1, 9, 2, 14, 7, 2, 3, 3, 3, 1, 2, 14, 1, 3, 23, 6, 3, 9, 2, 2, 529, 1, 2, 763, 1, 7, 161, 161, 2, 2, 3, 21, 3, 483, 23, 3, 2, 7, 42, 109, 3, 2, 23, 2, 109, 3, 1, 69, 4, 6, 23, 6, 3, 3, 14, 21, 2, 3133, 23, 6, 13, 2, 201, 161, 23, 126, 3, 2, 4, 1, 21, 109, 7, 3, 461, 21, 13, 23, 21, 75, 46, 12, 1, 8]

cp's OEIS Frontend

A354196 a(n) = A064989(A064989(sigma(sigma(A003961(A003961(n)))))), where A003961 shifts the prime factorization of n one step towards larger primes, and A064989 shifts it back towards smaller primes.

Table of values

List of values