A369899 - cp's OEIS frontend

A369899 a(1) = 1, a(2) = 2; for n > 2, a(n) is the smallest unused positive number that is a substring of the sum of all previous terms.

n	a(n)
1	1
2	2
3	3
4	6
5	12
6	4
7	8
8	36
9	7
10	9
11	88
12	17
13	19
14	21
15	23
16	5
17	26
18	28
19	15
20	30
21	60
22	20
23	40
24	48
25	52
26	58
27	38
28	67
29	43
30	78
31	64
32	92
33	10
34	103
35	11
36	14
37	115
38	27
39	13
40	31
41	34
42	37
43	41
44	45
45	50
46	51
47	16
48	18
49	63
50	69
51	68
52	83
53	91
54	201
55	22
56	33
57	66
58	32
59	236
60	260
61	86
62	29
63	75
64	305
65	35
66	39
67	42
68	47
69	351
70	386
71	25
72	80
73	360
74	72

[1, 2, 3, 6, 12, 4, 8, 36, 7, 9, 88, 17, 19, 21, 23, 5, 26, 28, 15, 30, 60, 20, 40, 48, 52, 58, 38, 67, 43, 78, 64, 92, 10, 103, 11, 14, 115, 27, 13, 31, 34, 37, 41, 45, 50, 51, 16, 18, 63, 69, 68, 83, 91, 201, 22, 33, 66, 32, 236, 260, 86, 29, 75, 305, 35, 39, 42, 47, 351, 386, 25, 80, 360, 72]

cp's OEIS Frontend

A369899 a(1) = 1, a(2) = 2; for n > 2, a(n) is the smallest unused positive number that is a substring of the sum of all previous terms.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	6
5	12
6	4
7	8
8	36
9	7
10	9
11	88
12	17
13	19
14	21
15	23
16	5
17	26
18	28
19	15
20	30
21	60
22	20
23	40
24	48
25	52
26	58
27	38
28	67
29	43
30	78
31	64
32	92
33	10
34	103
35	11
36	14
37	115
38	27
39	13
40	31
41	34
42	37
43	41
44	45
45	50
46	51
47	16
48	18
49	63
50	69
51	68
52	83
53	91
54	201
55	22
56	33
57	66
58	32
59	236
60	260
61	86
62	29
63	75
64	305
65	35
66	39
67	42
68	47
69	351
70	386
71	25
72	80
73	360
74	72

n	a(n)
1	1
2	2
3	3
4	6
5	12
6	4
7	8
8	36
9	7
10	9
11	88
12	17
13	19
14	21
15	23
16	5
17	26
18	28
19	15
20	30
21	60
22	20
23	40
24	48
25	52
26	58
27	38
28	67
29	43
30	78
31	64
32	92
33	10
34	103
35	11
36	14
37	115
38	27
39	13
40	31
41	34
42	37
43	41
44	45
45	50
46	51
47	16
48	18
49	63
50	69
51	68
52	83
53	91
54	201
55	22
56	33
57	66
58	32
59	236
60	260
61	86
62	29
63	75
64	305
65	35
66	39
67	42
68	47
69	351
70	386
71	25
72	80
73	360
74	72

n	a(n)
1	1
2	2
3	3
4	6
5	12
6	4
7	8
8	36
9	7
10	9
11	88
12	17
13	19
14	21
15	23
16	5
17	26
18	28
19	15
20	30
21	60
22	20
23	40
24	48
25	52
26	58
27	38
28	67
29	43
30	78
31	64
32	92
33	10
34	103
35	11
36	14
37	115
38	27
39	13
40	31
41	34
42	37
43	41
44	45
45	50
46	51
47	16
48	18
49	63
50	69
51	68
52	83
53	91
54	201
55	22
56	33
57	66
58	32
59	236
60	260
61	86
62	29
63	75
64	305
65	35
66	39
67	42
68	47
69	351
70	386
71	25
72	80
73	360
74	72