A026468 - cp's OEIS frontend

A026468 a(1) = 1, a(2) = 2; for n >= 3, a(n) = least positive integer > a(n-1) and not a(i)^2 + a(j)^2 for 1<=i<=j<=n-1.

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

[1, 2, 3, 4, 6, 7, 9, 11, 12, 14, 15, 16, 19, 21, 22, 23, 24, 26, 27, 28, 29, 30, 31, 33, 34, 35, 36, 38, 39, 41, 42, 43, 44, 46, 47, 48, 49, 51, 54, 55, 56, 57, 59, 60, 61, 62, 63, 64, 66, 67, 68, 69, 70, 71, 73, 74, 75, 76, 77, 78]

cp's OEIS Frontend

A026468 a(1) = 1, a(2) = 2; for n >= 3, a(n) = least positive integer > a(n-1) and not a(i)^2 + a(j)^2 for 1<=i<=j<=n-1.

Table of values

List of values

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

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

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