A348750 - cp's OEIS frontend

A348750 a(n) = A064989(A064989(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	1
4	23
5	1
6	1
7	3
8	7
9	13
10	1
11	1
12	23
13	2
14	3
15	1
16	305
17	1
18	13
19	2
20	23
21	3
22	1
23	1
24	7
25	39
26	2
27	4
28	69
29	13
30	1
31	3
32	69
33	1
34	1
35	3
36	299
37	5
38	2
39	2
40	7
41	1
42	3
43	1
44	23
45	13
46	1
47	2
48	305
49	53
50	39
51	1
52	46
53	23
54	4
55	1
56	21
57	2
58	13
59	11
60	23
61	1
62	3
63	39
64	19501
65	2
66	1
67	29
68	23
69	1
70	3
71	2
72	91
73	3
74	5
75	39
76	46
77	3
78	2
79	2
80	305
81	2791
82	1
83	9
84	69
85	1
86	1
87	13
88	7
89	11
90	13
91	6

[1, 1, 1, 23, 1, 1, 3, 7, 13, 1, 1, 23, 2, 3, 1, 305, 1, 13, 2, 23, 3, 1, 1, 7, 39, 2, 4, 69, 13, 1, 3, 69, 1, 1, 3, 299, 5, 2, 2, 7, 1, 3, 1, 23, 13, 1, 2, 305, 53, 39, 1, 46, 23, 4, 1, 21, 2, 13, 11, 23, 1, 3, 39, 19501, 2, 1, 29, 23, 1, 3, 2, 91, 3, 5, 39, 46, 3, 2, 2, 305, 2791, 1, 9, 69, 1, 1, 13, 7, 11, 13, 6]

cp's OEIS Frontend

A348750 a(n) = A064989(A064989(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