A082209 - cp's OEIS frontend

A082209 a(1) = 1, a(n) = smallest number such that the concatenation of a(n-1) and a(n) is a square.

n	a(n)
1	1
2	6
3	4
4	9
5	61
6	504
7	1
8	6
9	4
10	9
11	61
12	504
13	1
14	6
15	4
16	9
17	61
18	504
19	1
20	6
21	4
22	9
23	61
24	504
25	1
26	6
27	4
28	9
29	61
30	504
31	1
32	6
33	4
34	9
35	61
36	504
37	1
38	6
39	4
40	9
41	61
42	504
43	1
44	6
45	4
46	9
47	61
48	504
49	1
50	6
51	4
52	9
53	61
54	504
55	1
56	6
57	4
58	9
59	61
60	504
61	1
62	6
63	4
64	9
65	61
66	504
67	1
68	6
69	4
70	9
71	61
72	504
73	1
74	6
75	4
76	9
77	61
78	504
79	1
80	6
81	4
82	9
83	61

[1, 6, 4, 9, 61, 504, 1, 6, 4, 9, 61, 504, 1, 6, 4, 9, 61, 504, 1, 6, 4, 9, 61, 504, 1, 6, 4, 9, 61, 504, 1, 6, 4, 9, 61, 504, 1, 6, 4, 9, 61, 504, 1, 6, 4, 9, 61, 504, 1, 6, 4, 9, 61, 504, 1, 6, 4, 9, 61, 504, 1, 6, 4, 9, 61, 504, 1, 6, 4, 9, 61, 504, 1, 6, 4, 9, 61, 504, 1, 6, 4, 9, 61]

cp's OEIS Frontend

A082209 a(1) = 1, a(n) = smallest number such that the concatenation of a(n-1) and a(n) is a square.

Table of values

List of values

n	a(n)
1	1
2	6
3	4
4	9
5	61
6	504
7	1
8	6
9	4
10	9
11	61
12	504
13	1
14	6
15	4
16	9
17	61
18	504
19	1
20	6
21	4
22	9
23	61
24	504
25	1
26	6
27	4
28	9
29	61
30	504
31	1
32	6
33	4
34	9
35	61
36	504
37	1
38	6
39	4
40	9
41	61
42	504
43	1
44	6
45	4
46	9
47	61
48	504
49	1
50	6
51	4
52	9
53	61
54	504
55	1
56	6
57	4
58	9
59	61
60	504
61	1
62	6
63	4
64	9
65	61
66	504
67	1
68	6
69	4
70	9
71	61
72	504
73	1
74	6
75	4
76	9
77	61
78	504
79	1
80	6
81	4
82	9
83	61

n	a(n)
1	1
2	6
3	4
4	9
5	61
6	504
7	1
8	6
9	4
10	9
11	61
12	504
13	1
14	6
15	4
16	9
17	61
18	504
19	1
20	6
21	4
22	9
23	61
24	504
25	1
26	6
27	4
28	9
29	61
30	504
31	1
32	6
33	4
34	9
35	61
36	504
37	1
38	6
39	4
40	9
41	61
42	504
43	1
44	6
45	4
46	9
47	61
48	504
49	1
50	6
51	4
52	9
53	61
54	504
55	1
56	6
57	4
58	9
59	61
60	504
61	1
62	6
63	4
64	9
65	61
66	504
67	1
68	6
69	4
70	9
71	61
72	504
73	1
74	6
75	4
76	9
77	61
78	504
79	1
80	6
81	4
82	9
83	61

n	a(n)
1	1
2	6
3	4
4	9
5	61
6	504
7	1
8	6
9	4
10	9
11	61
12	504
13	1
14	6
15	4
16	9
17	61
18	504
19	1
20	6
21	4
22	9
23	61
24	504
25	1
26	6
27	4
28	9
29	61
30	504
31	1
32	6
33	4
34	9
35	61
36	504
37	1
38	6
39	4
40	9
41	61
42	504
43	1
44	6
45	4
46	9
47	61
48	504
49	1
50	6
51	4
52	9
53	61
54	504
55	1
56	6
57	4
58	9
59	61
60	504
61	1
62	6
63	4
64	9
65	61
66	504
67	1
68	6
69	4
70	9
71	61
72	504
73	1
74	6
75	4
76	9
77	61
78	504
79	1
80	6
81	4
82	9
83	61