A070812 - cp's OEIS frontend

A070812 a(n) = phi(gpf(n)) - gpf(phi(n)) = A000010(A006530(n)) - A006530(A000010(n)).

n	a(n)
3	0
4	-1
5	2
6	0
7	3
8	-1
9	-1
10	2
11	5
12	0
13	9
14	3
15	2
16	-1
17	14
18	-1
19	15
20	2
21	3
22	5
23	11
24	0
25	-1
26	9
27	-1
28	3
29	21
30	2
31	25
32	-1
33	5
34	14
35	3
36	-1
37	33
38	15
39	9
40	2
41	35
42	3
43	35
44	5
45	1
46	11
47	23
48	0
49	-1
50	-1
51	14
52	9
53	39
54	-1
55	5
56	3
57	15
58	21
59	29
60	2
61	55
62	25
63	3
64	-1
65	9
66	5
67	55
68	14
69	11
70	3
71	63
72	-1
73	69
74	33
75	-1
76	15
77	5
78	9
79	65
80	2
81	-1
82	35
83	41
84	3
85	14
86	35
87	21
88	5
89	77
90	1
91	9
92	11
93	25
94	23
95	15
96	0
97	93
98	-1
99	5

[0, -1, 2, 0, 3, -1, -1, 2, 5, 0, 9, 3, 2, -1, 14, -1, 15, 2, 3, 5, 11, 0, -1, 9, -1, 3, 21, 2, 25, -1, 5, 14, 3, -1, 33, 15, 9, 2, 35, 3, 35, 5, 1, 11, 23, 0, -1, -1, 14, 9, 39, -1, 5, 3, 15, 21, 29, 2, 55, 25, 3, -1, 9, 5, 55, 14, 11, 3, 63, -1, 69, 33, -1, 15, 5, 9, 65, 2, -1, 35, 41, 3, 14, 35, 21, 5, 77, 1, 9, 11, 25, 23, 15, 0, 93, -1, 5]

cp's OEIS Frontend

A070812 a(n) = phi(gpf(n)) - gpf(phi(n)) = A000010(A006530(n)) - A006530(A000010(n)).

Table of values

List of values

n	a(n)
3	0
4	-1
5	2
6	0
7	3
8	-1
9	-1
10	2
11	5
12	0
13	9
14	3
15	2
16	-1
17	14
18	-1
19	15
20	2
21	3
22	5
23	11
24	0
25	-1
26	9
27	-1
28	3
29	21
30	2
31	25
32	-1
33	5
34	14
35	3
36	-1
37	33
38	15
39	9
40	2
41	35
42	3
43	35
44	5
45	1
46	11
47	23
48	0
49	-1
50	-1
51	14
52	9
53	39
54	-1
55	5
56	3
57	15
58	21
59	29
60	2
61	55
62	25
63	3
64	-1
65	9
66	5
67	55
68	14
69	11
70	3
71	63
72	-1
73	69
74	33
75	-1
76	15
77	5
78	9
79	65
80	2
81	-1
82	35
83	41
84	3
85	14
86	35
87	21
88	5
89	77
90	1
91	9
92	11
93	25
94	23
95	15
96	0
97	93
98	-1
99	5

n	a(n)
3	0
4	-1
5	2
6	0
7	3
8	-1
9	-1
10	2
11	5
12	0
13	9
14	3
15	2
16	-1
17	14
18	-1
19	15
20	2
21	3
22	5
23	11
24	0
25	-1
26	9
27	-1
28	3
29	21
30	2
31	25
32	-1
33	5
34	14
35	3
36	-1
37	33
38	15
39	9
40	2
41	35
42	3
43	35
44	5
45	1
46	11
47	23
48	0
49	-1
50	-1
51	14
52	9
53	39
54	-1
55	5
56	3
57	15
58	21
59	29
60	2
61	55
62	25
63	3
64	-1
65	9
66	5
67	55
68	14
69	11
70	3
71	63
72	-1
73	69
74	33
75	-1
76	15
77	5
78	9
79	65
80	2
81	-1
82	35
83	41
84	3
85	14
86	35
87	21
88	5
89	77
90	1
91	9
92	11
93	25
94	23
95	15
96	0
97	93
98	-1
99	5

n	a(n)
3	0
4	-1
5	2
6	0
7	3
8	-1
9	-1
10	2
11	5
12	0
13	9
14	3
15	2
16	-1
17	14
18	-1
19	15
20	2
21	3
22	5
23	11
24	0
25	-1
26	9
27	-1
28	3
29	21
30	2
31	25
32	-1
33	5
34	14
35	3
36	-1
37	33
38	15
39	9
40	2
41	35
42	3
43	35
44	5
45	1
46	11
47	23
48	0
49	-1
50	-1
51	14
52	9
53	39
54	-1
55	5
56	3
57	15
58	21
59	29
60	2
61	55
62	25
63	3
64	-1
65	9
66	5
67	55
68	14
69	11
70	3
71	63
72	-1
73	69
74	33
75	-1
76	15
77	5
78	9
79	65
80	2
81	-1
82	35
83	41
84	3
85	14
86	35
87	21
88	5
89	77
90	1
91	9
92	11
93	25
94	23
95	15
96	0
97	93
98	-1
99	5