A003666 - cp's OEIS frontend

A003666 a(n) is smallest number which is uniquely of the form a(j) + a(k) with 1 <= j < k < n and a(1) = 1, a(2) = 4.

n	a(n)
1	1
2	4
3	5
4	6
5	7
6	8
7	10
8	16
9	18
10	19
11	21
12	31
13	32
14	33
15	42
16	46
17	56
18	57
19	66
20	70
21	79
22	82
23	91
24	96
25	104
26	105
27	107
28	116
29	129
30	130
31	131
32	141
33	158
34	165
35	168
36	179
37	180
38	182
39	191
40	204
41	205
42	206
43	216
44	217
45	218
46	219
47	229
48	230
49	244
50	256
51	266
52	267
53	268
54	281
55	290
56	315
57	316
58	317
59	318
60	328

[1, 4, 5, 6, 7, 8, 10, 16, 18, 19, 21, 31, 32, 33, 42, 46, 56, 57, 66, 70, 79, 82, 91, 96, 104, 105, 107, 116, 129, 130, 131, 141, 158, 165, 168, 179, 180, 182, 191, 204, 205, 206, 216, 217, 218, 219, 229, 230, 244, 256, 266, 267, 268, 281, 290, 315, 316, 317, 318, 328]

cp's OEIS Frontend

A003666 a(n) is smallest number which is uniquely of the form a(j) + a(k) with 1 <= j < k < n and a(1) = 1, a(2) = 4.

Table of values

List of values

n	a(n)
1	1
2	4
3	5
4	6
5	7
6	8
7	10
8	16
9	18
10	19
11	21
12	31
13	32
14	33
15	42
16	46
17	56
18	57
19	66
20	70
21	79
22	82
23	91
24	96
25	104
26	105
27	107
28	116
29	129
30	130
31	131
32	141
33	158
34	165
35	168
36	179
37	180
38	182
39	191
40	204
41	205
42	206
43	216
44	217
45	218
46	219
47	229
48	230
49	244
50	256
51	266
52	267
53	268
54	281
55	290
56	315
57	316
58	317
59	318
60	328

n	a(n)
1	1
2	4
3	5
4	6
5	7
6	8
7	10
8	16
9	18
10	19
11	21
12	31
13	32
14	33
15	42
16	46
17	56
18	57
19	66
20	70
21	79
22	82
23	91
24	96
25	104
26	105
27	107
28	116
29	129
30	130
31	131
32	141
33	158
34	165
35	168
36	179
37	180
38	182
39	191
40	204
41	205
42	206
43	216
44	217
45	218
46	219
47	229
48	230
49	244
50	256
51	266
52	267
53	268
54	281
55	290
56	315
57	316
58	317
59	318
60	328

n	a(n)
1	1
2	4
3	5
4	6
5	7
6	8
7	10
8	16
9	18
10	19
11	21
12	31
13	32
14	33
15	42
16	46
17	56
18	57
19	66
20	70
21	79
22	82
23	91
24	96
25	104
26	105
27	107
28	116
29	129
30	130
31	131
32	141
33	158
34	165
35	168
36	179
37	180
38	182
39	191
40	204
41	205
42	206
43	216
44	217
45	218
46	219
47	229
48	230
49	244
50	256
51	266
52	267
53	268
54	281
55	290
56	315
57	316
58	317
59	318
60	328