A088823 - cp's OEIS frontend

A088823 a(n) is the GCD of the sum of largest prime factors of numbers from 1 to n and of the sum of smallest prime factors of numbers from 1 to n.

n	a(n)
1	0
2	2
3	5
4	7
5	12
6	1
7	1
8	1
9	1
10	4
11	1
12	1
13	1
14	2
15	1
16	1
17	6
18	1
19	1
20	1
21	4
22	1
23	1
24	1
25	2
26	1
27	1
28	1
29	2
30	1
31	1
32	1
33	3
34	4
35	1
36	3
37	1
38	2
39	3
40	1
41	1
42	2
43	1
44	1
45	1
46	2
47	1
48	1
49	1
50	2
51	1
52	1
53	1
54	2
55	1
56	1
57	1
58	2
59	1
60	1
61	1
62	2
63	1
64	1
65	10
66	1
67	1
68	1
69	2
70	29
71	1
72	1
73	2
74	1
75	7
76	1
77	2
78	1
79	1
80	1
81	2
82	1
83	1
84	1
85	2
86	1
87	1
88	1
89	2
90	1
91	1
92	1
93	2
94	3
95	1
96	1
97	2
98	1
99	5
100	1
101	14
102	1
103	1

[0, 2, 5, 7, 12, 1, 1, 1, 1, 4, 1, 1, 1, 2, 1, 1, 6, 1, 1, 1, 4, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 3, 4, 1, 3, 1, 2, 3, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 10, 1, 1, 1, 2, 29, 1, 1, 2, 1, 7, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 3, 1, 1, 2, 1, 5, 1, 14, 1, 1]

cp's OEIS Frontend

A088823 a(n) is the GCD of the sum of largest prime factors of numbers from 1 to n and of the sum of smallest prime factors of numbers from 1 to n.

Table of values

List of values

n	a(n)
1	0
2	2
3	5
4	7
5	12
6	1
7	1
8	1
9	1
10	4
11	1
12	1
13	1
14	2
15	1
16	1
17	6
18	1
19	1
20	1
21	4
22	1
23	1
24	1
25	2
26	1
27	1
28	1
29	2
30	1
31	1
32	1
33	3
34	4
35	1
36	3
37	1
38	2
39	3
40	1
41	1
42	2
43	1
44	1
45	1
46	2
47	1
48	1
49	1
50	2
51	1
52	1
53	1
54	2
55	1
56	1
57	1
58	2
59	1
60	1
61	1
62	2
63	1
64	1
65	10
66	1
67	1
68	1
69	2
70	29
71	1
72	1
73	2
74	1
75	7
76	1
77	2
78	1
79	1
80	1
81	2
82	1
83	1
84	1
85	2
86	1
87	1
88	1
89	2
90	1
91	1
92	1
93	2
94	3
95	1
96	1
97	2
98	1
99	5
100	1
101	14
102	1
103	1

n	a(n)
1	0
2	2
3	5
4	7
5	12
6	1
7	1
8	1
9	1
10	4
11	1
12	1
13	1
14	2
15	1
16	1
17	6
18	1
19	1
20	1
21	4
22	1
23	1
24	1
25	2
26	1
27	1
28	1
29	2
30	1
31	1
32	1
33	3
34	4
35	1
36	3
37	1
38	2
39	3
40	1
41	1
42	2
43	1
44	1
45	1
46	2
47	1
48	1
49	1
50	2
51	1
52	1
53	1
54	2
55	1
56	1
57	1
58	2
59	1
60	1
61	1
62	2
63	1
64	1
65	10
66	1
67	1
68	1
69	2
70	29
71	1
72	1
73	2
74	1
75	7
76	1
77	2
78	1
79	1
80	1
81	2
82	1
83	1
84	1
85	2
86	1
87	1
88	1
89	2
90	1
91	1
92	1
93	2
94	3
95	1
96	1
97	2
98	1
99	5
100	1
101	14
102	1
103	1

n	a(n)
1	0
2	2
3	5
4	7
5	12
6	1
7	1
8	1
9	1
10	4
11	1
12	1
13	1
14	2
15	1
16	1
17	6
18	1
19	1
20	1
21	4
22	1
23	1
24	1
25	2
26	1
27	1
28	1
29	2
30	1
31	1
32	1
33	3
34	4
35	1
36	3
37	1
38	2
39	3
40	1
41	1
42	2
43	1
44	1
45	1
46	2
47	1
48	1
49	1
50	2
51	1
52	1
53	1
54	2
55	1
56	1
57	1
58	2
59	1
60	1
61	1
62	2
63	1
64	1
65	10
66	1
67	1
68	1
69	2
70	29
71	1
72	1
73	2
74	1
75	7
76	1
77	2
78	1
79	1
80	1
81	2
82	1
83	1
84	1
85	2
86	1
87	1
88	1
89	2
90	1
91	1
92	1
93	2
94	3
95	1
96	1
97	2
98	1
99	5
100	1
101	14
102	1
103	1