cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A055399 Number of stages of sieve of Eratosthenes needed to identify n as prime or composite.

Table of values

n a(n)
3 1
4 1
5 2
6 1
7 2
8 1
9 2
10 1
11 3
12 1
13 3
14 1
15 2
16 1
17 3
18 1
19 3
20 1
21 2
22 1
23 3
24 1
25 3
26 1
27 2
28 1
29 4
30 1
31 4
32 1
33 2
34 1
35 3
36 1
37 4
38 1
39 2
40 1
41 4
42 1
43 4
44 1
45 2
46 1
47 4
48 1
49 4
50 1
51 2
52 1
53 5
54 1
55 3
56 1
57 2
58 1
59 5
60 1
61 5
62 1
63 2
64 1
65 3
66 1
67 5
68 1
69 2
70 1
71 5
72 1
73 5
74 1
75 2
76 1
77 4
78 1
79 5
80 1
81 2
82 1
83 5
84 1
85 3
86 1
87 2
88 1
89 5

List of values

[1, 1, 2, 1, 2, 1, 2, 1, 3, 1, 3, 1, 2, 1, 3, 1, 3, 1, 2, 1, 3, 1, 3, 1, 2, 1, 4, 1, 4, 1, 2, 1, 3, 1, 4, 1, 2, 1, 4, 1, 4, 1, 2, 1, 4, 1, 4, 1, 2, 1, 5, 1, 3, 1, 2, 1, 5, 1, 5, 1, 2, 1, 3, 1, 5, 1, 2, 1, 5, 1, 5, 1, 2, 1, 4, 1, 5, 1, 2, 1, 5, 1, 3, 1, 2, 1, 5]