A090930 - cp's OEIS frontend

A090930 Permutation of natural numbers arising from a square spiral.

n	a(n)
1	1
2	2
3	9
4	8
5	7
6	6
7	5
8	4
9	3
10	12
11	11
12	10
13	25
14	24
15	23
16	22
17	21
18	20
19	19
20	18
21	17
22	16
23	15
24	14
25	13
26	30
27	29
28	28
29	27
30	26
31	49
32	48
33	47
34	46
35	45
36	44
37	43
38	42
39	41
40	40
41	39
42	38
43	37
44	36
45	35
46	34
47	33
48	32
49	31
50	56
51	55
52	54
53	53
54	52
55	51
56	50
57	81
58	80
59	79
60	78
61	77
62	76
63	75
64	74
65	73
66	72
67	71
68	70
69	69
70	68
71	67
72	66

[1, 2, 9, 8, 7, 6, 5, 4, 3, 12, 11, 10, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 30, 29, 28, 27, 26, 49, 48, 47, 46, 45, 44, 43, 42, 41, 40, 39, 38, 37, 36, 35, 34, 33, 32, 31, 56, 55, 54, 53, 52, 51, 50, 81, 80, 79, 78, 77, 76, 75, 74, 73, 72, 71, 70, 69, 68, 67, 66]

cp's OEIS Frontend

A090930 Permutation of natural numbers arising from a square spiral.

Table of values

List of values

n	a(n)
1	1
2	2
3	9
4	8
5	7
6	6
7	5
8	4
9	3
10	12
11	11
12	10
13	25
14	24
15	23
16	22
17	21
18	20
19	19
20	18
21	17
22	16
23	15
24	14
25	13
26	30
27	29
28	28
29	27
30	26
31	49
32	48
33	47
34	46
35	45
36	44
37	43
38	42
39	41
40	40
41	39
42	38
43	37
44	36
45	35
46	34
47	33
48	32
49	31
50	56
51	55
52	54
53	53
54	52
55	51
56	50
57	81
58	80
59	79
60	78
61	77
62	76
63	75
64	74
65	73
66	72
67	71
68	70
69	69
70	68
71	67
72	66

n	a(n)
1	1
2	2
3	9
4	8
5	7
6	6
7	5
8	4
9	3
10	12
11	11
12	10
13	25
14	24
15	23
16	22
17	21
18	20
19	19
20	18
21	17
22	16
23	15
24	14
25	13
26	30
27	29
28	28
29	27
30	26
31	49
32	48
33	47
34	46
35	45
36	44
37	43
38	42
39	41
40	40
41	39
42	38
43	37
44	36
45	35
46	34
47	33
48	32
49	31
50	56
51	55
52	54
53	53
54	52
55	51
56	50
57	81
58	80
59	79
60	78
61	77
62	76
63	75
64	74
65	73
66	72
67	71
68	70
69	69
70	68
71	67
72	66

n	a(n)
1	1
2	2
3	9
4	8
5	7
6	6
7	5
8	4
9	3
10	12
11	11
12	10
13	25
14	24
15	23
16	22
17	21
18	20
19	19
20	18
21	17
22	16
23	15
24	14
25	13
26	30
27	29
28	28
29	27
30	26
31	49
32	48
33	47
34	46
35	45
36	44
37	43
38	42
39	41
40	40
41	39
42	38
43	37
44	36
45	35
46	34
47	33
48	32
49	31
50	56
51	55
52	54
53	53
54	52
55	51
56	50
57	81
58	80
59	79
60	78
61	77
62	76
63	75
64	74
65	73
66	72
67	71
68	70
69	69
70	68
71	67
72	66