A337117 - cp's OEIS frontend

A337117 Spiral on a 2D square lattice, one term per cell, starting at the origin with 0; the four integers forming any 2 X 2 square add up to a palindrome.

n	a(n)
1	0
2	1
3	2
4	3
5	4
6	15
7	5
8	13
9	8
10	6
11	7
12	12
13	9
14	10
15	18
16	19
17	11
18	21
19	26
20	20
21	14
22	16
23	32
24	24
25	17
26	22
27	43
28	45
29	35
30	55
31	23
32	34
33	46
34	25
35	37
36	44
37	27
38	29
39	38
40	36
41	39
42	28
43	30
44	49
45	42
46	31
47	54
48	56
49	66
50	33
51	40
52	76
53	48
54	53
55	59
56	65
57	41
58	52
59	62
60	60
61	50
62	69
63	72
64	79
65	47
66	89
67	57
68	67
69	61
70	86
71	99

[0, 1, 2, 3, 4, 15, 5, 13, 8, 6, 7, 12, 9, 10, 18, 19, 11, 21, 26, 20, 14, 16, 32, 24, 17, 22, 43, 45, 35, 55, 23, 34, 46, 25, 37, 44, 27, 29, 38, 36, 39, 28, 30, 49, 42, 31, 54, 56, 66, 33, 40, 76, 48, 53, 59, 65, 41, 52, 62, 60, 50, 69, 72, 79, 47, 89, 57, 67, 61, 86, 99]

cp's OEIS Frontend

A337117 Spiral on a 2D square lattice, one term per cell, starting at the origin with 0; the four integers forming any 2 X 2 square add up to a palindrome.

Table of values

List of values

n	a(n)
1	0
2	1
3	2
4	3
5	4
6	15
7	5
8	13
9	8
10	6
11	7
12	12
13	9
14	10
15	18
16	19
17	11
18	21
19	26
20	20
21	14
22	16
23	32
24	24
25	17
26	22
27	43
28	45
29	35
30	55
31	23
32	34
33	46
34	25
35	37
36	44
37	27
38	29
39	38
40	36
41	39
42	28
43	30
44	49
45	42
46	31
47	54
48	56
49	66
50	33
51	40
52	76
53	48
54	53
55	59
56	65
57	41
58	52
59	62
60	60
61	50
62	69
63	72
64	79
65	47
66	89
67	57
68	67
69	61
70	86
71	99

n	a(n)
1	0
2	1
3	2
4	3
5	4
6	15
7	5
8	13
9	8
10	6
11	7
12	12
13	9
14	10
15	18
16	19
17	11
18	21
19	26
20	20
21	14
22	16
23	32
24	24
25	17
26	22
27	43
28	45
29	35
30	55
31	23
32	34
33	46
34	25
35	37
36	44
37	27
38	29
39	38
40	36
41	39
42	28
43	30
44	49
45	42
46	31
47	54
48	56
49	66
50	33
51	40
52	76
53	48
54	53
55	59
56	65
57	41
58	52
59	62
60	60
61	50
62	69
63	72
64	79
65	47
66	89
67	57
68	67
69	61
70	86
71	99

n	a(n)
1	0
2	1
3	2
4	3
5	4
6	15
7	5
8	13
9	8
10	6
11	7
12	12
13	9
14	10
15	18
16	19
17	11
18	21
19	26
20	20
21	14
22	16
23	32
24	24
25	17
26	22
27	43
28	45
29	35
30	55
31	23
32	34
33	46
34	25
35	37
36	44
37	27
38	29
39	38
40	36
41	39
42	28
43	30
44	49
45	42
46	31
47	54
48	56
49	66
50	33
51	40
52	76
53	48
54	53
55	59
56	65
57	41
58	52
59	62
60	60
61	50
62	69
63	72
64	79
65	47
66	89
67	57
68	67
69	61
70	86
71	99