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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.

A109923 a(n) = lcm(1,2,3,...,prime(n))/(1 + 2 + ... + prime(n)).

Table of values

n a(n)
2 1
3 4
4 15
5 420
6 3960
7 80080
8 1225224
9 19399380
10 5354228880
11 145568097675
12 7600186994400
13 254425307479200
14 9957281351799600
15 392482839950100900
16 114779426083185063200
17 5474978624167927514640
18 312603618218620377448800

List of values

[1, 4, 15, 420, 3960, 80080, 1225224, 19399380, 5354228880, 145568097675, 7600186994400, 254425307479200, 9957281351799600, 392482839950100900, 114779426083185063200, 5474978624167927514640, 312603618218620377448800]

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

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