A336830 - cp's OEIS frontend

A336830 The Sydney Opera House sequence: a(0) = 0, a(1) = 1; for n > 0, a(n) = min(a(n-1)/n if n|a(n-1), a(n-1)-n) where a(n) is nonnegative and not already in the sequence. Otherwise a(n) = min(a(n-1)+n, a(n-1)*n) where a(n) is not already in the sequence. Otherwise a(n) = a(n-1) + n.

n	a(n)
0	0
1	1
2	2
3	5
4	9
5	4
6	10
7	3
8	11
9	20
10	30
11	19
12	7
13	91
14	77
15	62
16	46
17	29
18	47
19	28
20	8
21	168
22	146
23	123
24	99
25	74
26	48
27	21
28	49
29	78
30	108
31	139
32	107
33	140
34	106
35	71
36	35
37	72
38	34
39	73
40	33
41	1353
42	1311
43	1268
44	1224
45	1179
46	1133
47	1086
48	1038
49	989
50	939
51	888
52	836
53	783
54	729
55	674
56	618
57	561
58	503
59	444
60	384
61	323
62	261

[0, 1, 2, 5, 9, 4, 10, 3, 11, 20, 30, 19, 7, 91, 77, 62, 46, 29, 47, 28, 8, 168, 146, 123, 99, 74, 48, 21, 49, 78, 108, 139, 107, 140, 106, 71, 35, 72, 34, 73, 33, 1353, 1311, 1268, 1224, 1179, 1133, 1086, 1038, 989, 939, 888, 836, 783, 729, 674, 618, 561, 503, 444, 384, 323, 261]

cp's OEIS Frontend

A336830 The Sydney Opera House sequence: a(0) = 0, a(1) = 1; for n > 0, a(n) = min(a(n-1)/n if n|a(n-1), a(n-1)-n) where a(n) is nonnegative and not already in the sequence. Otherwise a(n) = min(a(n-1)+n, a(n-1)*n) where a(n) is not already in the sequence. Otherwise a(n) = a(n-1) + n.

Table of values

List of values