A081303 - cp's OEIS frontend

A081303 gpf(m) - 2*spf(m), where gpf(m) is the greatest and spf(m) is the smallest prime factor of m (A006530, A020639).

n	a(n)
1	-1
2	-2
3	-3
4	-2
5	-5
6	-1
7	-7
8	-2
9	-3
10	1
11	-11
12	-1
13	-13
14	3
15	-1
16	-2
17	-17
18	-1
19	-19
20	1
21	1
22	7
23	-23
24	-1
25	-5
26	9
27	-3
28	3
29	-29
30	1
31	-31
32	-2
33	5
34	13
35	-3
36	-1
37	-37
38	15
39	7
40	1
41	-41
42	3
43	-43
44	7
45	-1
46	19
47	-47
48	-1
49	-7
50	1
51	11
52	9
53	-53
54	-1
55	1
56	3
57	13
58	25
59	-59
60	1
61	-61
62	27
63	1
64	-2
65	3
66	7
67	-67
68	13
69	17
70	3
71	-71
72	-1
73	-73
74	33
75	-1
76	15

[-1, -2, -3, -2, -5, -1, -7, -2, -3, 1, -11, -1, -13, 3, -1, -2, -17, -1, -19, 1, 1, 7, -23, -1, -5, 9, -3, 3, -29, 1, -31, -2, 5, 13, -3, -1, -37, 15, 7, 1, -41, 3, -43, 7, -1, 19, -47, -1, -7, 1, 11, 9, -53, -1, 1, 3, 13, 25, -59, 1, -61, 27, 1, -2, 3, 7, -67, 13, 17, 3, -71, -1, -73, 33, -1, 15]

cp's OEIS Frontend

A081303 gpf(m) - 2*spf(m), where gpf(m) is the greatest and spf(m) is the smallest prime factor of m (A006530, A020639).

Table of values

List of values

n	a(n)
1	-1
2	-2
3	-3
4	-2
5	-5
6	-1
7	-7
8	-2
9	-3
10	1
11	-11
12	-1
13	-13
14	3
15	-1
16	-2
17	-17
18	-1
19	-19
20	1
21	1
22	7
23	-23
24	-1
25	-5
26	9
27	-3
28	3
29	-29
30	1
31	-31
32	-2
33	5
34	13
35	-3
36	-1
37	-37
38	15
39	7
40	1
41	-41
42	3
43	-43
44	7
45	-1
46	19
47	-47
48	-1
49	-7
50	1
51	11
52	9
53	-53
54	-1
55	1
56	3
57	13
58	25
59	-59
60	1
61	-61
62	27
63	1
64	-2
65	3
66	7
67	-67
68	13
69	17
70	3
71	-71
72	-1
73	-73
74	33
75	-1
76	15

n	a(n)
1	-1
2	-2
3	-3
4	-2
5	-5
6	-1
7	-7
8	-2
9	-3
10	1
11	-11
12	-1
13	-13
14	3
15	-1
16	-2
17	-17
18	-1
19	-19
20	1
21	1
22	7
23	-23
24	-1
25	-5
26	9
27	-3
28	3
29	-29
30	1
31	-31
32	-2
33	5
34	13
35	-3
36	-1
37	-37
38	15
39	7
40	1
41	-41
42	3
43	-43
44	7
45	-1
46	19
47	-47
48	-1
49	-7
50	1
51	11
52	9
53	-53
54	-1
55	1
56	3
57	13
58	25
59	-59
60	1
61	-61
62	27
63	1
64	-2
65	3
66	7
67	-67
68	13
69	17
70	3
71	-71
72	-1
73	-73
74	33
75	-1
76	15

n	a(n)
1	-1
2	-2
3	-3
4	-2
5	-5
6	-1
7	-7
8	-2
9	-3
10	1
11	-11
12	-1
13	-13
14	3
15	-1
16	-2
17	-17
18	-1
19	-19
20	1
21	1
22	7
23	-23
24	-1
25	-5
26	9
27	-3
28	3
29	-29
30	1
31	-31
32	-2
33	5
34	13
35	-3
36	-1
37	-37
38	15
39	7
40	1
41	-41
42	3
43	-43
44	7
45	-1
46	19
47	-47
48	-1
49	-7
50	1
51	11
52	9
53	-53
54	-1
55	1
56	3
57	13
58	25
59	-59
60	1
61	-61
62	27
63	1
64	-2
65	3
66	7
67	-67
68	13
69	17
70	3
71	-71
72	-1
73	-73
74	33
75	-1
76	15