A081309 - cp's OEIS frontend

A081309 Smallest prime p such that n-p is a 3-smooth number, a(n)=0 if no such prime exists.

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

[0, 0, 2, 2, 2, 2, 3, 2, 3, 2, 2, 3, 5, 2, 3, 7, 5, 2, 3, 2, 3, 13, 5, 23, 7, 2, 3, 19, 2, 3, 7, 5, 17, 2, 3, 0, 5, 2, 3, 13, 5, 41, 7, 17, 13, 19, 11, 47, 13, 2, 3, 43, 5, 53, 7, 2, 3, 31, 5, 59, 7, 53, 31, 37, 11, 2, 3, 41, 5, 43, 7, 71, 19, 2, 3, 67, 5, 0, 7, 53, 17, 73, 2, 3, 13, 5, 23, 7, 17, 89]

cp's OEIS Frontend

A081309 Smallest prime p such that n-p is a 3-smooth number, a(n)=0 if no such prime exists.

Table of values

List of values

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

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

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