A331521 - cp's OEIS frontend

A331521 a(n) is the least positive k such that A002645(n) - k^4 is a fourth power.

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

[1, 1, 2, 1, 3, 2, 4, 1, 2, 4, 6, 3, 5, 2, 8, 7, 2, 4, 6, 9, 4, 10, 5, 12, 8, 1, 3, 5, 13, 11, 2, 4, 14, 5, 7, 11, 14, 2, 6, 8, 10, 16, 12, 1, 3, 9, 14, 10, 17, 16, 2, 4, 8, 15, 10, 17, 1, 7, 11, 13, 18, 6, 8, 12, 3, 7, 19, 9, 11, 2, 19, 16, 1, 9, 13, 12, 23]

cp's OEIS Frontend

A331521 a(n) is the least positive k such that A002645(n) - k^4 is a fourth power.

Table of values

List of values

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

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

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