login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A082551 as a simple table

na(n)
1-1
2-1
3-1
4-1
5-1
60
7-1
8-1
9-1
10-1
11-1
121
13-1
14-1
15-1
16-1
17-1
181
19-1
201
21-1
22-1
23-1
241
25-1
26-1
27-1
280
29-1
301
31-1
32-1
33-1
34-1
35-1
361
37-1
38-1
39-1
401
41-1
421
43-1
44-1
45-1
46-1
47-1
481
49-1
50-1
51-1
52-1
53-1
541
55-1
561
57-1
58-1
59-1
601
61-1
62-1
63-1
64-1
65-1
661
67-1
68-1
69-1
701
71-1
721
73-1

[-1,-1,-1,-1,-1,0,-1,-1,-1,-1,-1,1,-1,-1,-1,-1,-1,
 1,-1,1,-1,-1,-1,1,-1,-1,-1,0,-1,1,-1,-1,-1,-1,-1,
 1,-1,-1,-1,1,-1,1,-1,-1,-1,-1,-1,1,-1,-1,-1,-1,-1,
 1,-1,1,-1,-1,-1,1,-1,-1,-1,-1,-1,1,-1,-1,-1,1,-1,
 1,-1]