A286541 - cp's OEIS frontend

A286541 Compound filter (the left & right summand of Hofstadter-Conway $10000 sequence): a(n) = P(A004001(A004001(n-1)), A004001(n-A004001(n-1))), where P(n,k) is sequence A000027 used as a pairing function, with a(1) = a(2) = 0.

n	a(n)
1	0
2	0
3	1
4	1
5	2
6	5
7	5
8	5
9	8
10	13
11	19
12	19
13	25
14	25
15	25
16	25
17	32
18	41
19	51
20	62
21	62
22	73
23	86
24	86
25	99
26	99
27	99
28	113
29	113
30	113
31	113
32	113
33	128
34	145
35	163
36	182
37	202
38	202
39	222
40	244
41	267
42	267
43	290
44	315
45	315
46	340
47	340
48	340
49	366
50	394
51	394
52	422
53	422
54	422
55	451
56	451
57	451
58	451
59	481
60	481
61	481
62	481
63	481
64	481
65	512
66	545
67	579
68	614
69	650
70	687
71	687
72	724
73	763
74	803
75	844
76	844
77	885
78	928
79	972
80	972

[0, 0, 1, 1, 2, 5, 5, 5, 8, 13, 19, 19, 25, 25, 25, 25, 32, 41, 51, 62, 62, 73, 86, 86, 99, 99, 99, 113, 113, 113, 113, 113, 128, 145, 163, 182, 202, 202, 222, 244, 267, 267, 290, 315, 315, 340, 340, 340, 366, 394, 394, 422, 422, 422, 451, 451, 451, 451, 481, 481, 481, 481, 481, 481, 512, 545, 579, 614, 650, 687, 687, 724, 763, 803, 844, 844, 885, 928, 972, 972]

cp's OEIS Frontend

A286541 Compound filter (the left & right summand of Hofstadter-Conway $10000 sequence): a(n) = P(A004001(A004001(n-1)), A004001(n-A004001(n-1))), where P(n,k) is sequence A000027 used as a pairing function, with a(1) = a(2) = 0.

Table of values

List of values

n	a(n)
1	0
2	0
3	1
4	1
5	2
6	5
7	5
8	5
9	8
10	13
11	19
12	19
13	25
14	25
15	25
16	25
17	32
18	41
19	51
20	62
21	62
22	73
23	86
24	86
25	99
26	99
27	99
28	113
29	113
30	113
31	113
32	113
33	128
34	145
35	163
36	182
37	202
38	202
39	222
40	244
41	267
42	267
43	290
44	315
45	315
46	340
47	340
48	340
49	366
50	394
51	394
52	422
53	422
54	422
55	451
56	451
57	451
58	451
59	481
60	481
61	481
62	481
63	481
64	481
65	512
66	545
67	579
68	614
69	650
70	687
71	687
72	724
73	763
74	803
75	844
76	844
77	885
78	928
79	972
80	972

n	a(n)
1	0
2	0
3	1
4	1
5	2
6	5
7	5
8	5
9	8
10	13
11	19
12	19
13	25
14	25
15	25
16	25
17	32
18	41
19	51
20	62
21	62
22	73
23	86
24	86
25	99
26	99
27	99
28	113
29	113
30	113
31	113
32	113
33	128
34	145
35	163
36	182
37	202
38	202
39	222
40	244
41	267
42	267
43	290
44	315
45	315
46	340
47	340
48	340
49	366
50	394
51	394
52	422
53	422
54	422
55	451
56	451
57	451
58	451
59	481
60	481
61	481
62	481
63	481
64	481
65	512
66	545
67	579
68	614
69	650
70	687
71	687
72	724
73	763
74	803
75	844
76	844
77	885
78	928
79	972
80	972

n	a(n)
1	0
2	0
3	1
4	1
5	2
6	5
7	5
8	5
9	8
10	13
11	19
12	19
13	25
14	25
15	25
16	25
17	32
18	41
19	51
20	62
21	62
22	73
23	86
24	86
25	99
26	99
27	99
28	113
29	113
30	113
31	113
32	113
33	128
34	145
35	163
36	182
37	202
38	202
39	222
40	244
41	267
42	267
43	290
44	315
45	315
46	340
47	340
48	340
49	366
50	394
51	394
52	422
53	422
54	422
55	451
56	451
57	451
58	451
59	481
60	481
61	481
62	481
63	481
64	481
65	512
66	545
67	579
68	614
69	650
70	687
71	687
72	724
73	763
74	803
75	844
76	844
77	885
78	928
79	972
80	972