A354198 - cp's OEIS frontend

A354198 a(n) = A064989(A064989(sigma(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	3
3	1
4	3
5	3
6	3
7	2
8	26
9	23
10	3
11	3
12	3
13	1
14	3
15	21
16	6
17	3
18	9
19	14
20	22
21	2
22	2
23	7
24	182
25	3
26	14
27	313
28	201
29	3
30	3
31	3
32	603
33	3
34	3
35	3
36	115
37	3
38	3
39	2
40	3
41	3
42	21
43	2
44	9
45	9
46	3
47	2
48	75
49	2
50	22
51	3
52	109
53	3
54	21
55	46
56	109
57	2
58	23
59	7
60	154
61	3
62	6
63	22
64	222
65	2
66	14
67	2
68	22
69	29
70	6
71	1
72	78
73	3
74	161
75	69
76	1407
77	6
78	2
79	21
80	44
81	7
82	21
83	14
84	201
85	21
86	39
87	3
88	529

[1, 3, 1, 3, 3, 3, 2, 26, 23, 3, 3, 3, 1, 3, 21, 6, 3, 9, 14, 22, 2, 2, 7, 182, 3, 14, 313, 201, 3, 3, 3, 603, 3, 3, 3, 115, 3, 3, 2, 3, 3, 21, 2, 9, 9, 3, 2, 75, 2, 22, 3, 109, 3, 21, 46, 109, 2, 23, 7, 154, 3, 6, 22, 222, 2, 14, 2, 22, 29, 6, 1, 78, 3, 161, 69, 1407, 6, 2, 21, 44, 7, 21, 14, 201, 21, 39, 3, 529]

cp's OEIS Frontend

A354198 a(n) = A064989(A064989(sigma(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