A049878 - cp's OEIS frontend

A049878 a(n) = min(j,k), where u(n) = u(j) + u(k) is the unique sum of Ulam numbers described in A002859 (with 1 <= j < k < n).

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

[1, 1, 1, 2, 3, 3, 4, 3, 5, 4, 3, 5, 4, 3, 4, 3, 5, 4, 3, 4, 3, 5, 4, 3, 15, 1, 2, 8, 3, 11, 3, 14, 3, 2, 3, 5, 19, 21, 3, 24, 3, 17, 4, 3, 4, 3, 27, 3, 27, 3, 4, 27, 3, 27, 3, 4, 3, 5, 27, 3, 4, 27, 3, 27, 3, 27, 3, 27, 3, 36, 2, 3, 5, 27, 14, 27, 3, 27, 3, 27, 3, 4, 3, 27, 3, 4, 27, 3]

cp's OEIS Frontend

A049878 a(n) = min(j,k), where u(n) = u(j) + u(k) is the unique sum of Ulam numbers described in A002859 (with 1 <= j < k < n).

Table of values

List of values

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

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

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