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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.

A225871 Number of people required for there to be a 50% probability that at least 4 share a birthday in a year with n days.

Table of values

n a(n)
1 4
2 6
3 7
4 9
5 10
6 11
7 12
8 13
9 15
10 16
11 17
12 18
13 18
14 19
15 20
16 21
17 22
18 23
19 24
20 25
21 25
22 26
23 27
24 28
25 28
26 29
27 30
28 31
29 32
30 32
31 33
32 34
33 34
34 35
35 36
36 37
37 37
38 38
39 39
40 39
41 40
42 41
43 41
44 42
45 43
46 43
47 44
48 45
49 45
50 46
51 46
52 47
53 48
54 48
55 49
56 50
57 50
58 51
59 51
60 52
61 53
62 53
63 54
64 54
65 55
66 56

List of values

[4, 6, 7, 9, 10, 11, 12, 13, 15, 16, 17, 18, 18, 19, 20, 21, 22, 23, 24, 25, 25, 26, 27, 28, 28, 29, 30, 31, 32, 32, 33, 34, 34, 35, 36, 37, 37, 38, 39, 39, 40, 41, 41, 42, 43, 43, 44, 45, 45, 46, 46, 47, 48, 48, 49, 50, 50, 51, 51, 52, 53, 53, 54, 54, 55, 56]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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