A341672 - cp's OEIS frontend

A341672 a(n) is the number of numbers on the square spiral board such that it takes n steps for them to reach square 1 along the shortest path without stepping on any prime number.

n	a(n)
0	1
1	4
2	7
3	5
4	9
5	8
6	12
7	10
8	14
9	23
10	29
11	32
12	35
13	38
14	46
15	47
16	52
17	59
18	65
19	64
20	67
21	76
22	78
23	84
24	90
25	91
26	94
27	100
28	106
29	110
30	111
31	110
32	119
33	126
34	131
35	137
36	139
37	138
38	143
39	153
40	154
41	144
42	152
43	144
44	152
45	156
46	170
47	195
48	193
49	193
50	192
51	198
52	203
53	215
54	215
55	209
56	216
57	222
58	225

[1, 4, 7, 5, 9, 8, 12, 10, 14, 23, 29, 32, 35, 38, 46, 47, 52, 59, 65, 64, 67, 76, 78, 84, 90, 91, 94, 100, 106, 110, 111, 110, 119, 126, 131, 137, 139, 138, 143, 153, 154, 144, 152, 144, 152, 156, 170, 195, 193, 193, 192, 198, 203, 215, 215, 209, 216, 222, 225]

cp's OEIS Frontend

A341672 a(n) is the number of numbers on the square spiral board such that it takes n steps for them to reach square 1 along the shortest path without stepping on any prime number.

Table of values

List of values

n	a(n)
0	1
1	4
2	7
3	5
4	9
5	8
6	12
7	10
8	14
9	23
10	29
11	32
12	35
13	38
14	46
15	47
16	52
17	59
18	65
19	64
20	67
21	76
22	78
23	84
24	90
25	91
26	94
27	100
28	106
29	110
30	111
31	110
32	119
33	126
34	131
35	137
36	139
37	138
38	143
39	153
40	154
41	144
42	152
43	144
44	152
45	156
46	170
47	195
48	193
49	193
50	192
51	198
52	203
53	215
54	215
55	209
56	216
57	222
58	225

n	a(n)
0	1
1	4
2	7
3	5
4	9
5	8
6	12
7	10
8	14
9	23
10	29
11	32
12	35
13	38
14	46
15	47
16	52
17	59
18	65
19	64
20	67
21	76
22	78
23	84
24	90
25	91
26	94
27	100
28	106
29	110
30	111
31	110
32	119
33	126
34	131
35	137
36	139
37	138
38	143
39	153
40	154
41	144
42	152
43	144
44	152
45	156
46	170
47	195
48	193
49	193
50	192
51	198
52	203
53	215
54	215
55	209
56	216
57	222
58	225

n	a(n)
0	1
1	4
2	7
3	5
4	9
5	8
6	12
7	10
8	14
9	23
10	29
11	32
12	35
13	38
14	46
15	47
16	52
17	59
18	65
19	64
20	67
21	76
22	78
23	84
24	90
25	91
26	94
27	100
28	106
29	110
30	111
31	110
32	119
33	126
34	131
35	137
36	139
37	138
38	143
39	153
40	154
41	144
42	152
43	144
44	152
45	156
46	170
47	195
48	193
49	193
50	192
51	198
52	203
53	215
54	215
55	209
56	216
57	222
58	225