A109411 - cp's OEIS frontend

A109411 Partition the sequence of positive integers into minimal groups so that sum of terms in each group is a semiprime; sequence gives sizes of the groups.

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

[3, 1, 4, 1, 1, 5, 2, 3, 1, 1, 13, 3, 1, 3, 2, 2, 2, 1, 4, 6, 2, 1, 6, 1, 2, 2, 1, 14, 4, 1, 1, 1, 3, 5, 2, 1, 2, 2, 1, 3, 1, 10, 2, 7, 5, 4, 2, 1, 2, 2, 2, 6, 1, 2, 3, 5, 2, 3, 4, 5, 6, 2, 3, 2, 2, 4, 1, 14, 1, 1, 4, 7, 5, 2, 3, 6, 1, 2, 2, 2, 1, 2, 2, 1, 4, 2, 2, 2, 3, 17, 2, 3, 1, 10, 3, 1, 3, 6, 1, 4, 2, 1]

cp's OEIS Frontend

A109411 Partition the sequence of positive integers into minimal groups so that sum of terms in each group is a semiprime; sequence gives sizes of the groups.

Table of values

List of values

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

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

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