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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.

A354860 a(n) is the denominator of 1/prime(n) + 2/prime(n-1) + 3/prime(n-2) + ... + (n-1)/3 + n/2.

Table of values

n a(n)
1 2
2 3
3 30
4 35
5 2310
6 15015
7 34034
8 4849845
9 223092870
10 154040315
11 200560490130
12 742073813481
13 101416754509070
14 6541380665835015
15 55899071144408310
16 5431526412865007455
17 54936010004406075402
18 4511091590746421960895
19 2619440517026755685293030
20 278970415063349480483707695

List of values

[2, 3, 30, 35, 2310, 15015, 34034, 4849845, 223092870, 154040315, 200560490130, 742073813481, 101416754509070, 6541380665835015, 55899071144408310, 5431526412865007455, 54936010004406075402, 4511091590746421960895, 2619440517026755685293030, 278970415063349480483707695]

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

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