A203988 - cp's OEIS frontend

A203988 a(1)=1 and, for n>1, a(n) is the smallest positive integer greater than a(n-1) such that a(n)+a(k) is not a square for k=1,2,...,n-1.

n	a(n)
1	1
2	2
3	4
4	6
5	9
6	11
7	13
8	17
9	18
10	20
11	22
12	26
13	28
14	33
15	37
16	39
17	41
18	49
19	50
20	52
21	54
22	56
23	57
24	66
25	73
26	76
27	81
28	85
29	86
30	97
31	100
32	102
33	106
34	109
35	114
36	121
37	129
38	134
39	137
40	145
41	148
42	153
43	161
44	162
45	164
46	166
47	172
48	177
49	181
50	182
51	191
52	193
53	196
54	198
55	201
56	211
57	220
58	225
59	226

[1, 2, 4, 6, 9, 11, 13, 17, 18, 20, 22, 26, 28, 33, 37, 39, 41, 49, 50, 52, 54, 56, 57, 66, 73, 76, 81, 85, 86, 97, 100, 102, 106, 109, 114, 121, 129, 134, 137, 145, 148, 153, 161, 162, 164, 166, 172, 177, 181, 182, 191, 193, 196, 198, 201, 211, 220, 225, 226]

cp's OEIS Frontend

A203988 a(1)=1 and, for n>1, a(n) is the smallest positive integer greater than a(n-1) such that a(n)+a(k) is not a square for k=1,2,...,n-1.

Table of values

List of values

n	a(n)
1	1
2	2
3	4
4	6
5	9
6	11
7	13
8	17
9	18
10	20
11	22
12	26
13	28
14	33
15	37
16	39
17	41
18	49
19	50
20	52
21	54
22	56
23	57
24	66
25	73
26	76
27	81
28	85
29	86
30	97
31	100
32	102
33	106
34	109
35	114
36	121
37	129
38	134
39	137
40	145
41	148
42	153
43	161
44	162
45	164
46	166
47	172
48	177
49	181
50	182
51	191
52	193
53	196
54	198
55	201
56	211
57	220
58	225
59	226

n	a(n)
1	1
2	2
3	4
4	6
5	9
6	11
7	13
8	17
9	18
10	20
11	22
12	26
13	28
14	33
15	37
16	39
17	41
18	49
19	50
20	52
21	54
22	56
23	57
24	66
25	73
26	76
27	81
28	85
29	86
30	97
31	100
32	102
33	106
34	109
35	114
36	121
37	129
38	134
39	137
40	145
41	148
42	153
43	161
44	162
45	164
46	166
47	172
48	177
49	181
50	182
51	191
52	193
53	196
54	198
55	201
56	211
57	220
58	225
59	226

n	a(n)
1	1
2	2
3	4
4	6
5	9
6	11
7	13
8	17
9	18
10	20
11	22
12	26
13	28
14	33
15	37
16	39
17	41
18	49
19	50
20	52
21	54
22	56
23	57
24	66
25	73
26	76
27	81
28	85
29	86
30	97
31	100
32	102
33	106
34	109
35	114
36	121
37	129
38	134
39	137
40	145
41	148
42	153
43	161
44	162
45	164
46	166
47	172
48	177
49	181
50	182
51	191
52	193
53	196
54	198
55	201
56	211
57	220
58	225
59	226