A068584 - cp's OEIS frontend

A068584 Numbers k such that the denominator of (Sum_{j=1..k} 1/j)^2 equals the denominator of Sum_{j=1..k} 1/j^2.

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	9
7	15
8	16
9	17
10	28
11	29
12	30
13	31
14	32
15	49
16	91
17	92
18	93
19	94
20	95
21	96
22	97
23	98
24	99
25	125
26	126
27	127
28	128
29	129
30	130
31	131
32	132
33	133
34	134
35	135
36	243
37	244
38	245
39	246
40	247
41	248
42	249
43	968
44	969
45	970
46	971
47	972
48	973
49	974
50	975
51	976
52	977
53	978
54	979
55	980
56	981
57	982
58	983
59	984

[1, 2, 3, 4, 5, 9, 15, 16, 17, 28, 29, 30, 31, 32, 49, 91, 92, 93, 94, 95, 96, 97, 98, 99, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 243, 244, 245, 246, 247, 248, 249, 968, 969, 970, 971, 972, 973, 974, 975, 976, 977, 978, 979, 980, 981, 982, 983, 984]

cp's OEIS Frontend

A068584 Numbers k such that the denominator of (Sum_{j=1..k} 1/j)^2 equals the denominator of Sum_{j=1..k} 1/j^2.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	9
7	15
8	16
9	17
10	28
11	29
12	30
13	31
14	32
15	49
16	91
17	92
18	93
19	94
20	95
21	96
22	97
23	98
24	99
25	125
26	126
27	127
28	128
29	129
30	130
31	131
32	132
33	133
34	134
35	135
36	243
37	244
38	245
39	246
40	247
41	248
42	249
43	968
44	969
45	970
46	971
47	972
48	973
49	974
50	975
51	976
52	977
53	978
54	979
55	980
56	981
57	982
58	983
59	984

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	9
7	15
8	16
9	17
10	28
11	29
12	30
13	31
14	32
15	49
16	91
17	92
18	93
19	94
20	95
21	96
22	97
23	98
24	99
25	125
26	126
27	127
28	128
29	129
30	130
31	131
32	132
33	133
34	134
35	135
36	243
37	244
38	245
39	246
40	247
41	248
42	249
43	968
44	969
45	970
46	971
47	972
48	973
49	974
50	975
51	976
52	977
53	978
54	979
55	980
56	981
57	982
58	983
59	984

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	9
7	15
8	16
9	17
10	28
11	29
12	30
13	31
14	32
15	49
16	91
17	92
18	93
19	94
20	95
21	96
22	97
23	98
24	99
25	125
26	126
27	127
28	128
29	129
30	130
31	131
32	132
33	133
34	134
35	135
36	243
37	244
38	245
39	246
40	247
41	248
42	249
43	968
44	969
45	970
46	971
47	972
48	973
49	974
50	975
51	976
52	977
53	978
54	979
55	980
56	981
57	982
58	983
59	984