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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.

A141220 Write the n-th nonprime (A018252(n)) as a product of primes; increase one copy of the largest prime by 2 and decrease one copy of the smallest prime by 1, multiply the resulting numbers.

Table of values

n a(n)
1 1
2 4
3 5
4 8
5 10
6 7
7 10
8 9
9 14
10 16
11 15
12 14
13 18
14 13
15 20
16 28
17 15
18 30
19 18
20 21
21 32
22 26
23 19
24 36
25 30
26 21
27 30
28 28
29 27
30 26
31 42
32 25
33 40
34 54
35 35
36 38
37 30
38 45
39 52
40 36
41 42
42 31
43 42
44 33
45 54
46 64
47 60
48 39
49 38
50 50
51 45
52 60
53 39
54 70
55 42
56 78
57 45
58 56
59 90
60 43
61 54
62 76
63 45
64 62
65 52
66 63
67 90

List of values

[1, 4, 5, 8, 10, 7, 10, 9, 14, 16, 15, 14, 18, 13, 20, 28, 15, 30, 18, 21, 32, 26, 19, 36, 30, 21, 30, 28, 27, 26, 42, 25, 40, 54, 35, 38, 30, 45, 52, 36, 42, 31, 42, 33, 54, 64, 60, 39, 38, 50, 45, 60, 39, 70, 42, 78, 45, 56, 90, 43, 54, 76, 45, 62, 52, 63, 90]

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

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