A379057 - cp's OEIS frontend

A379057 a(0) = 0; thereafter a(n) is the least integer (in absolute value) not yet in the sequence such that the absolute difference between a(n-1) and a(n) is a square > 1; in case of a tie, preference is given to the positive value.

n	a(n)
0	0
1	4
2	-5
3	-1
4	3
5	-6
6	-2
7	2
8	6
9	-3
10	1
11	5
12	-4
13	-8
14	8
15	12
16	-13
17	-9
18	7
19	11
20	-14
21	-10
22	15
23	19
24	10
25	14
26	-11
27	-7
28	9
29	13
30	-12
31	-16
32	20
33	16
34	-20
35	-24
36	-15
37	-19
38	17
39	21
40	25
41	29
42	33
43	24
44	-25
45	-21
46	-17
47	-26
48	-22
49	-18
50	18
51	22
52	26
53	-23
54	-27
55	-31
56	-35
57	-39
58	-30
59	34
60	30
61	-34

[0, 4, -5, -1, 3, -6, -2, 2, 6, -3, 1, 5, -4, -8, 8, 12, -13, -9, 7, 11, -14, -10, 15, 19, 10, 14, -11, -7, 9, 13, -12, -16, 20, 16, -20, -24, -15, -19, 17, 21, 25, 29, 33, 24, -25, -21, -17, -26, -22, -18, 18, 22, 26, -23, -27, -31, -35, -39, -30, 34, 30, -34]

cp's OEIS Frontend

A379057 a(0) = 0; thereafter a(n) is the least integer (in absolute value) not yet in the sequence such that the absolute difference between a(n-1) and a(n) is a square > 1; in case of a tie, preference is given to the positive value.

Table of values

List of values

n	a(n)
0	0
1	4
2	-5
3	-1
4	3
5	-6
6	-2
7	2
8	6
9	-3
10	1
11	5
12	-4
13	-8
14	8
15	12
16	-13
17	-9
18	7
19	11
20	-14
21	-10
22	15
23	19
24	10
25	14
26	-11
27	-7
28	9
29	13
30	-12
31	-16
32	20
33	16
34	-20
35	-24
36	-15
37	-19
38	17
39	21
40	25
41	29
42	33
43	24
44	-25
45	-21
46	-17
47	-26
48	-22
49	-18
50	18
51	22
52	26
53	-23
54	-27
55	-31
56	-35
57	-39
58	-30
59	34
60	30
61	-34

n	a(n)
0	0
1	4
2	-5
3	-1
4	3
5	-6
6	-2
7	2
8	6
9	-3
10	1
11	5
12	-4
13	-8
14	8
15	12
16	-13
17	-9
18	7
19	11
20	-14
21	-10
22	15
23	19
24	10
25	14
26	-11
27	-7
28	9
29	13
30	-12
31	-16
32	20
33	16
34	-20
35	-24
36	-15
37	-19
38	17
39	21
40	25
41	29
42	33
43	24
44	-25
45	-21
46	-17
47	-26
48	-22
49	-18
50	18
51	22
52	26
53	-23
54	-27
55	-31
56	-35
57	-39
58	-30
59	34
60	30
61	-34

n	a(n)
0	0
1	4
2	-5
3	-1
4	3
5	-6
6	-2
7	2
8	6
9	-3
10	1
11	5
12	-4
13	-8
14	8
15	12
16	-13
17	-9
18	7
19	11
20	-14
21	-10
22	15
23	19
24	10
25	14
26	-11
27	-7
28	9
29	13
30	-12
31	-16
32	20
33	16
34	-20
35	-24
36	-15
37	-19
38	17
39	21
40	25
41	29
42	33
43	24
44	-25
45	-21
46	-17
47	-26
48	-22
49	-18
50	18
51	22
52	26
53	-23
54	-27
55	-31
56	-35
57	-39
58	-30
59	34
60	30
61	-34