cp's OEIS Frontend

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.

A232090 Minimal possible denominator for a sum of the form 1 +/- 1/2 +/- 1/3 +/- ... +/- 1/n.

Table of values

n a(n)
1 1
2 2
3 6
4 12
5 60
6 20
7 140
8 280
9 2520
10 2520
11 27720
12 27720
13 360360
14 360360
15 72072
16 144144
17 2450448
18 272272
19 5173168
20 5173168
21 739024
22 739024
23 16997552
24 16997552
25 424938800
26 424938800
27 11473347600
28 11473347600
29 332727080400
30 332727080400

List of values

[1, 2, 6, 12, 60, 20, 140, 280, 2520, 2520, 27720, 27720, 360360, 360360, 72072, 144144, 2450448, 272272, 5173168, 5173168, 739024, 739024, 16997552, 16997552, 424938800, 424938800, 11473347600, 11473347600, 332727080400, 332727080400]

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

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