A262690 - cp's OEIS frontend

A262690 a(n) = largest square k <= n such that A002828(n-k) = A002828(n)-1.

n	a(n)
0	0
1	1
2	1
3	1
4	4
5	4
6	4
7	4
8	4
9	9
10	9
11	9
12	4
13	9
14	9
15	9
16	16
17	16
18	9
19	9
20	16
21	16
22	9
23	9
24	16
25	25
26	25
27	25
28	25
29	25
30	25
31	25
32	16
33	25
34	25
35	25
36	36
37	36
38	36
39	36
40	36
41	25
42	25
43	25
44	36
45	36
46	36
47	36
48	16
49	49
50	49
51	49
52	36
53	49
54	49
55	49
56	36
57	49
58	49
59	49
60	49
61	36
62	49
63	49
64	64
65	64
66	64
67	49
68	64
69	64
70	36
71	49
72	36
73	64
74	49
75	49
76	36
77	64
78	49
79	49
80	64
81	81
82	81
83	81
84	64
85	81
86	81
87	81
88	36
89	64
90	81
91	81
92	81
93	64
94	81
95	81
96	64
97	81
98	49
99	81
100	100

[0, 1, 1, 1, 4, 4, 4, 4, 4, 9, 9, 9, 4, 9, 9, 9, 16, 16, 9, 9, 16, 16, 9, 9, 16, 25, 25, 25, 25, 25, 25, 25, 16, 25, 25, 25, 36, 36, 36, 36, 36, 25, 25, 25, 36, 36, 36, 36, 16, 49, 49, 49, 36, 49, 49, 49, 36, 49, 49, 49, 49, 36, 49, 49, 64, 64, 64, 49, 64, 64, 36, 49, 36, 64, 49, 49, 36, 64, 49, 49, 64, 81, 81, 81, 64, 81, 81, 81, 36, 64, 81, 81, 81, 64, 81, 81, 64, 81, 49, 81, 100]

cp's OEIS Frontend

A262690 a(n) = largest square k <= n such that A002828(n-k) = A002828(n)-1.

Table of values

List of values

n	a(n)
0	0
1	1
2	1
3	1
4	4
5	4
6	4
7	4
8	4
9	9
10	9
11	9
12	4
13	9
14	9
15	9
16	16
17	16
18	9
19	9
20	16
21	16
22	9
23	9
24	16
25	25
26	25
27	25
28	25
29	25
30	25
31	25
32	16
33	25
34	25
35	25
36	36
37	36
38	36
39	36
40	36
41	25
42	25
43	25
44	36
45	36
46	36
47	36
48	16
49	49
50	49
51	49
52	36
53	49
54	49
55	49
56	36
57	49
58	49
59	49
60	49
61	36
62	49
63	49
64	64
65	64
66	64
67	49
68	64
69	64
70	36
71	49
72	36
73	64
74	49
75	49
76	36
77	64
78	49
79	49
80	64
81	81
82	81
83	81
84	64
85	81
86	81
87	81
88	36
89	64
90	81
91	81
92	81
93	64
94	81
95	81
96	64
97	81
98	49
99	81
100	100

n	a(n)
0	0
1	1
2	1
3	1
4	4
5	4
6	4
7	4
8	4
9	9
10	9
11	9
12	4
13	9
14	9
15	9
16	16
17	16
18	9
19	9
20	16
21	16
22	9
23	9
24	16
25	25
26	25
27	25
28	25
29	25
30	25
31	25
32	16
33	25
34	25
35	25
36	36
37	36
38	36
39	36
40	36
41	25
42	25
43	25
44	36
45	36
46	36
47	36
48	16
49	49
50	49
51	49
52	36
53	49
54	49
55	49
56	36
57	49
58	49
59	49
60	49
61	36
62	49
63	49
64	64
65	64
66	64
67	49
68	64
69	64
70	36
71	49
72	36
73	64
74	49
75	49
76	36
77	64
78	49
79	49
80	64
81	81
82	81
83	81
84	64
85	81
86	81
87	81
88	36
89	64
90	81
91	81
92	81
93	64
94	81
95	81
96	64
97	81
98	49
99	81
100	100

n	a(n)
0	0
1	1
2	1
3	1
4	4
5	4
6	4
7	4
8	4
9	9
10	9
11	9
12	4
13	9
14	9
15	9
16	16
17	16
18	9
19	9
20	16
21	16
22	9
23	9
24	16
25	25
26	25
27	25
28	25
29	25
30	25
31	25
32	16
33	25
34	25
35	25
36	36
37	36
38	36
39	36
40	36
41	25
42	25
43	25
44	36
45	36
46	36
47	36
48	16
49	49
50	49
51	49
52	36
53	49
54	49
55	49
56	36
57	49
58	49
59	49
60	49
61	36
62	49
63	49
64	64
65	64
66	64
67	49
68	64
69	64
70	36
71	49
72	36
73	64
74	49
75	49
76	36
77	64
78	49
79	49
80	64
81	81
82	81
83	81
84	64
85	81
86	81
87	81
88	36
89	64
90	81
91	81
92	81
93	64
94	81
95	81
96	64
97	81
98	49
99	81
100	100