A241658 - cp's OEIS frontend

A241658 Smallest semiprime, sp, such that n - sp is a semiprime, or a(n)=0 if there is no such sp.

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

[0, 0, 0, 0, 0, 0, 0, 4, 0, 4, 0, 6, 4, 4, 6, 6, 0, 4, 4, 6, 6, 0, 9, 9, 4, 4, 6, 6, 4, 4, 6, 6, 0, 9, 9, 10, 4, 4, 4, 6, 6, 4, 4, 6, 6, 21, 9, 9, 10, 4, 25, 6, 4, 15, 4, 10, 6, 9, 4, 9, 4, 4, 6, 6, 10, 4, 9, 6, 4, 15, 6, 10, 4, 9, 6, 14, 15, 4, 10, 6, 4, 25, 6, 10, 34, 4, 10, 6, 4, 4]

cp's OEIS Frontend

A241658 Smallest semiprime, sp, such that n - sp is a semiprime, or a(n)=0 if there is no such sp.

Table of values

List of values

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

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

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