A108421 - cp's OEIS frontend

A108421 Smallest number of ones needed to write in binary representation 2*n as sum of two primes.

n	a(n)
2	2
3	4
4	4
5	4
6	5
7	5
8	5
9	5
10	4
11	4
12	5
13	6
14	5
15	5
16	6
17	4
18	5
19	6
20	5
21	5
22	5
23	5
24	6
25	6
26	6
27	5
28	6
29	5
30	6
31	7
32	7
33	7
34	8
35	5
36	5
37	6
38	5
39	5
40	6
41	6
42	5
43	6
44	6
45	5
46	6
47	6
48	7
49	8
50	5
51	5
52	6
53	6
54	6
55	6
56	7
57	5
58	6
59	6
60	7
61	8
62	7
63	7
64	8
65	6
66	7
67	5
68	5
69	6
70	5
71	5
72	6
73	6
74	5
75	6
76	6
77	5
78	6
79	7
80	7
81	7
82	6
83	6
84	6
85	6
86	6
87	6
88	7
89	6
90	6
91	7
92	7
93	7
94	8
95	7
96	8
97	6
98	5
99	5
100	6
101	6
102	6
103	6
104	7
105	5
106	6

[2, 4, 4, 4, 5, 5, 5, 5, 4, 4, 5, 6, 5, 5, 6, 4, 5, 6, 5, 5, 5, 5, 6, 6, 6, 5, 6, 5, 6, 7, 7, 7, 8, 5, 5, 6, 5, 5, 6, 6, 5, 6, 6, 5, 6, 6, 7, 8, 5, 5, 6, 6, 6, 6, 7, 5, 6, 6, 7, 8, 7, 7, 8, 6, 7, 5, 5, 6, 5, 5, 6, 6, 5, 6, 6, 5, 6, 7, 7, 7, 6, 6, 6, 6, 6, 6, 7, 6, 6, 7, 7, 7, 8, 7, 8, 6, 5, 5, 6, 6, 6, 6, 7, 5, 6]

cp's OEIS Frontend

A108421 Smallest number of ones needed to write in binary representation 2*n as sum of two primes.

Table of values

List of values

n	a(n)
2	2
3	4
4	4
5	4
6	5
7	5
8	5
9	5
10	4
11	4
12	5
13	6
14	5
15	5
16	6
17	4
18	5
19	6
20	5
21	5
22	5
23	5
24	6
25	6
26	6
27	5
28	6
29	5
30	6
31	7
32	7
33	7
34	8
35	5
36	5
37	6
38	5
39	5
40	6
41	6
42	5
43	6
44	6
45	5
46	6
47	6
48	7
49	8
50	5
51	5
52	6
53	6
54	6
55	6
56	7
57	5
58	6
59	6
60	7
61	8
62	7
63	7
64	8
65	6
66	7
67	5
68	5
69	6
70	5
71	5
72	6
73	6
74	5
75	6
76	6
77	5
78	6
79	7
80	7
81	7
82	6
83	6
84	6
85	6
86	6
87	6
88	7
89	6
90	6
91	7
92	7
93	7
94	8
95	7
96	8
97	6
98	5
99	5
100	6
101	6
102	6
103	6
104	7
105	5
106	6

n	a(n)
2	2
3	4
4	4
5	4
6	5
7	5
8	5
9	5
10	4
11	4
12	5
13	6
14	5
15	5
16	6
17	4
18	5
19	6
20	5
21	5
22	5
23	5
24	6
25	6
26	6
27	5
28	6
29	5
30	6
31	7
32	7
33	7
34	8
35	5
36	5
37	6
38	5
39	5
40	6
41	6
42	5
43	6
44	6
45	5
46	6
47	6
48	7
49	8
50	5
51	5
52	6
53	6
54	6
55	6
56	7
57	5
58	6
59	6
60	7
61	8
62	7
63	7
64	8
65	6
66	7
67	5
68	5
69	6
70	5
71	5
72	6
73	6
74	5
75	6
76	6
77	5
78	6
79	7
80	7
81	7
82	6
83	6
84	6
85	6
86	6
87	6
88	7
89	6
90	6
91	7
92	7
93	7
94	8
95	7
96	8
97	6
98	5
99	5
100	6
101	6
102	6
103	6
104	7
105	5
106	6

n	a(n)
2	2
3	4
4	4
5	4
6	5
7	5
8	5
9	5
10	4
11	4
12	5
13	6
14	5
15	5
16	6
17	4
18	5
19	6
20	5
21	5
22	5
23	5
24	6
25	6
26	6
27	5
28	6
29	5
30	6
31	7
32	7
33	7
34	8
35	5
36	5
37	6
38	5
39	5
40	6
41	6
42	5
43	6
44	6
45	5
46	6
47	6
48	7
49	8
50	5
51	5
52	6
53	6
54	6
55	6
56	7
57	5
58	6
59	6
60	7
61	8
62	7
63	7
64	8
65	6
66	7
67	5
68	5
69	6
70	5
71	5
72	6
73	6
74	5
75	6
76	6
77	5
78	6
79	7
80	7
81	7
82	6
83	6
84	6
85	6
86	6
87	6
88	7
89	6
90	6
91	7
92	7
93	7
94	8
95	7
96	8
97	6
98	5
99	5
100	6
101	6
102	6
103	6
104	7
105	5
106	6