A212103 - cp's OEIS frontend

A212103 Number of (w,x,y,z) with all terms in {1,...,n} and w = harmonic mean of {x,y,z}.

n	a(n)
0	0
1	1
2	2
3	3
4	10
5	11
6	30
7	31
8	38
9	39
10	52
11	53
12	84
13	85
14	86
15	117
16	124
17	125
18	144
19	145
20	200
21	225
22	226
23	227
24	282
25	283
26	284
27	285
28	334
29	335
30	420
31	421
32	428
33	435
34	436
35	491
36	546
37	547
38	548
39	555
40	634
41	635
42	726
43	727
44	758
45	837
46	838
47	839
48	936
49	937
50	956
51	957
52	970
53	971

[0, 1, 2, 3, 10, 11, 30, 31, 38, 39, 52, 53, 84, 85, 86, 117, 124, 125, 144, 145, 200, 225, 226, 227, 282, 283, 284, 285, 334, 335, 420, 421, 428, 435, 436, 491, 546, 547, 548, 555, 634, 635, 726, 727, 758, 837, 838, 839, 936, 937, 956, 957, 970, 971]

cp's OEIS Frontend

A212103 Number of (w,x,y,z) with all terms in {1,...,n} and w = harmonic mean of {x,y,z}.

Table of values

List of values

n	a(n)
0	0
1	1
2	2
3	3
4	10
5	11
6	30
7	31
8	38
9	39
10	52
11	53
12	84
13	85
14	86
15	117
16	124
17	125
18	144
19	145
20	200
21	225
22	226
23	227
24	282
25	283
26	284
27	285
28	334
29	335
30	420
31	421
32	428
33	435
34	436
35	491
36	546
37	547
38	548
39	555
40	634
41	635
42	726
43	727
44	758
45	837
46	838
47	839
48	936
49	937
50	956
51	957
52	970
53	971

n	a(n)
0	0
1	1
2	2
3	3
4	10
5	11
6	30
7	31
8	38
9	39
10	52
11	53
12	84
13	85
14	86
15	117
16	124
17	125
18	144
19	145
20	200
21	225
22	226
23	227
24	282
25	283
26	284
27	285
28	334
29	335
30	420
31	421
32	428
33	435
34	436
35	491
36	546
37	547
38	548
39	555
40	634
41	635
42	726
43	727
44	758
45	837
46	838
47	839
48	936
49	937
50	956
51	957
52	970
53	971

n	a(n)
0	0
1	1
2	2
3	3
4	10
5	11
6	30
7	31
8	38
9	39
10	52
11	53
12	84
13	85
14	86
15	117
16	124
17	125
18	144
19	145
20	200
21	225
22	226
23	227
24	282
25	283
26	284
27	285
28	334
29	335
30	420
31	421
32	428
33	435
34	436
35	491
36	546
37	547
38	548
39	555
40	634
41	635
42	726
43	727
44	758
45	837
46	838
47	839
48	936
49	937
50	956
51	957
52	970
53	971