A248715 - cp's OEIS frontend

A248715 Isolated numbers: Mark the lowest number that doesn't touch a number that has already been mark on grid of number spiraling outward.

n	a(n)
1	1
2	10
3	12
4	15
5	17
6	19
7	21
8	23
9	31
10	48
11	50
12	52
13	54
14	60
15	62
16	64
17	67
18	69
19	71
20	73
21	75
22	77
23	89
24	91
25	93
26	101
27	118
28	120
29	122
30	124
31	126
32	128
33	138
34	140
35	142
36	148
37	150
38	152
39	154
40	156
41	159
42	161
43	163
44	179
45	181
46	183
47	185
48	187
49	195
50	197
51	199
52	211
53	220
54	222
55	224
56	226
57	228

[1, 10, 12, 15, 17, 19, 21, 23, 31, 48, 50, 52, 54, 60, 62, 64, 67, 69, 71, 73, 75, 77, 89, 91, 93, 101, 118, 120, 122, 124, 126, 128, 138, 140, 142, 148, 150, 152, 154, 156, 159, 161, 163, 179, 181, 183, 185, 187, 195, 197, 199, 211, 220, 222, 224, 226, 228]

cp's OEIS Frontend

A248715 Isolated numbers: Mark the lowest number that doesn't touch a number that has already been mark on grid of number spiraling outward.

Table of values

List of values

n	a(n)
1	1
2	10
3	12
4	15
5	17
6	19
7	21
8	23
9	31
10	48
11	50
12	52
13	54
14	60
15	62
16	64
17	67
18	69
19	71
20	73
21	75
22	77
23	89
24	91
25	93
26	101
27	118
28	120
29	122
30	124
31	126
32	128
33	138
34	140
35	142
36	148
37	150
38	152
39	154
40	156
41	159
42	161
43	163
44	179
45	181
46	183
47	185
48	187
49	195
50	197
51	199
52	211
53	220
54	222
55	224
56	226
57	228

n	a(n)
1	1
2	10
3	12
4	15
5	17
6	19
7	21
8	23
9	31
10	48
11	50
12	52
13	54
14	60
15	62
16	64
17	67
18	69
19	71
20	73
21	75
22	77
23	89
24	91
25	93
26	101
27	118
28	120
29	122
30	124
31	126
32	128
33	138
34	140
35	142
36	148
37	150
38	152
39	154
40	156
41	159
42	161
43	163
44	179
45	181
46	183
47	185
48	187
49	195
50	197
51	199
52	211
53	220
54	222
55	224
56	226
57	228

n	a(n)
1	1
2	10
3	12
4	15
5	17
6	19
7	21
8	23
9	31
10	48
11	50
12	52
13	54
14	60
15	62
16	64
17	67
18	69
19	71
20	73
21	75
22	77
23	89
24	91
25	93
26	101
27	118
28	120
29	122
30	124
31	126
32	128
33	138
34	140
35	142
36	148
37	150
38	152
39	154
40	156
41	159
42	161
43	163
44	179
45	181
46	183
47	185
48	187
49	195
50	197
51	199
52	211
53	220
54	222
55	224
56	226
57	228