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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.

A064462 First row of Pascal's triangle that has n nonsquarefree entries, or -1 if no such row exists.

Table of values

n a(n)
0 0
1 6
2 4
3 14
4 13
5 10
6 8
7 -1
8 9
9 12
10 -1
11 22
12 17
13 20
14 -1
15 16
16 -1
17 18
18 29
19 26
20 31
21 24
22 25
23 62
24 -1
25 28
26 27
27 34
28 35
29 42
30 33
31 32
32 -1
33 -1
34 -1
35 36
36 53
37 40
38 45
39 -1
40 -1
41 -1
42 95
43 -1
44 -1
45 -1
46 79
47 48
48 49
49 50
50 55
51 54
52 57
53 60
54 69
55 56
56 63
57 74
58 -1
59 70
60 67
61 66
62 65
63 64
64 77
65 -1

List of values

[0, 6, 4, 14, 13, 10, 8, -1, 9, 12, -1, 22, 17, 20, -1, 16, -1, 18, 29, 26, 31, 24, 25, 62, -1, 28, 27, 34, 35, 42, 33, 32, -1, -1, -1, 36, 53, 40, 45, -1, -1, -1, 95, -1, -1, -1, 79, 48, 49, 50, 55, 54, 57, 60, 69, 56, 63, 74, -1, 70, 67, 66, 65, 64, 77, -1]

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

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