A303954 - cp's OEIS frontend

A303954 A fractal-like sequence: erasing all pairs of contiguous terms that don't sum up to a square leaves the sequence unchanged.

n	a(n)
1	1
2	2
3	7
4	3
5	1
6	8
7	4
8	5
9	6
10	10
11	9
12	16
13	11
14	14
15	12
16	13
17	15
18	21
19	17
20	19
21	18
22	31
23	20
24	29
25	22
26	27
27	23
28	2
29	7
30	42
31	24
32	25
33	26
34	38
35	28
36	36
37	30
38	34
39	32
40	49
41	33
42	3
43	1
44	8
45	41
46	35
47	46
48	37
49	44
50	39
51	61
52	40
53	60
54	43
55	57
56	45
57	4
58	5
59	59
60	47
61	53
62	48
63	52
64	50
65	71
66	51
67	70
68	54
69	67

[1, 2, 7, 3, 1, 8, 4, 5, 6, 10, 9, 16, 11, 14, 12, 13, 15, 21, 17, 19, 18, 31, 20, 29, 22, 27, 23, 2, 7, 42, 24, 25, 26, 38, 28, 36, 30, 34, 32, 49, 33, 3, 1, 8, 41, 35, 46, 37, 44, 39, 61, 40, 60, 43, 57, 45, 4, 5, 59, 47, 53, 48, 52, 50, 71, 51, 70, 54, 67]

cp's OEIS Frontend

A303954 A fractal-like sequence: erasing all pairs of contiguous terms that don't sum up to a square leaves the sequence unchanged.

Table of values

List of values

n	a(n)
1	1
2	2
3	7
4	3
5	1
6	8
7	4
8	5
9	6
10	10
11	9
12	16
13	11
14	14
15	12
16	13
17	15
18	21
19	17
20	19
21	18
22	31
23	20
24	29
25	22
26	27
27	23
28	2
29	7
30	42
31	24
32	25
33	26
34	38
35	28
36	36
37	30
38	34
39	32
40	49
41	33
42	3
43	1
44	8
45	41
46	35
47	46
48	37
49	44
50	39
51	61
52	40
53	60
54	43
55	57
56	45
57	4
58	5
59	59
60	47
61	53
62	48
63	52
64	50
65	71
66	51
67	70
68	54
69	67

n	a(n)
1	1
2	2
3	7
4	3
5	1
6	8
7	4
8	5
9	6
10	10
11	9
12	16
13	11
14	14
15	12
16	13
17	15
18	21
19	17
20	19
21	18
22	31
23	20
24	29
25	22
26	27
27	23
28	2
29	7
30	42
31	24
32	25
33	26
34	38
35	28
36	36
37	30
38	34
39	32
40	49
41	33
42	3
43	1
44	8
45	41
46	35
47	46
48	37
49	44
50	39
51	61
52	40
53	60
54	43
55	57
56	45
57	4
58	5
59	59
60	47
61	53
62	48
63	52
64	50
65	71
66	51
67	70
68	54
69	67

n	a(n)
1	1
2	2
3	7
4	3
5	1
6	8
7	4
8	5
9	6
10	10
11	9
12	16
13	11
14	14
15	12
16	13
17	15
18	21
19	17
20	19
21	18
22	31
23	20
24	29
25	22
26	27
27	23
28	2
29	7
30	42
31	24
32	25
33	26
34	38
35	28
36	36
37	30
38	34
39	32
40	49
41	33
42	3
43	1
44	8
45	41
46	35
47	46
48	37
49	44
50	39
51	61
52	40
53	60
54	43
55	57
56	45
57	4
58	5
59	59
60	47
61	53
62	48
63	52
64	50
65	71
66	51
67	70
68	54
69	67