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A305974 as a simple table

n a(n)
1 1
2 -1
3 -1
4 -2
5 -1
6 2
7 -1
8 -3
9 -2
10 3
11 -1
12 4
13 -1
14 5
15 6
16 -4
17 -1
18 7
19 -1
20 8
21 9
22 10
23 -1
24 11
25 -2
26 12
27 -3
28 13
29 -1
30 14
31 -1
32 -5
33 15
34 16
35 17
36 18
37 -1
38 19
39 20
40 21
41 -1
42 22
43 -1
44 23
45 24
46 25
47 -1
48 26
49 -2
50 27
51 28
52 29
53 -1
54 30
55 31
56 32
57 33
58 34
59 -1
60 35
61 -1
62 36
63 37
64 -6
65 38
66 39
67 -1
68 40
69 41
70 42
71 -1
72 43
73 -1
74 44
75 45
76 46
77 47
78 48
79 -1
80 49
81 -4
82 50
83 -1
84 51
85 52

[1,-1,-1,-2,-1,2,-1,-3,-2,3,-1,4,-1,5,6,-4,-1,7,
 -1,8,9,10,-1,11,-2,12,-3,13,-1,14,-1,-5,15,16,17,
 18,-1,19,20,21,-1,22,-1,23,24,25,-1,26,-2,27,28,
 29,-1,30,31,32,33,34,-1,35,-1,36,37,-6,38,39,-1,
 40,41,42,-1,43,-1,44,45,46,47,48,-1,49,-4,50,-1,
 51,52]

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Last modified March 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)