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.

A250071 Smallest number k such that the symmetric representation of sigma(k) has maximum width n for those k whose representation has nondecreasing width up to the diagonal.

Table of values

n a(n)
1 1
2 6
3 72
4 120
5 5184
6 1440
7 373248
8 6720
9 28800
10 103680
11 1934917632
12 80640
13 278628139008
14 7464960
15 2073600
16 483840
17 1444408272617472
18 1612800
19 103997395628457984
20 5806080
21 298598400
22 77396705280
23 539122498937926189056
24 7096320
25 1658880000
26 5572562780160
27 90316800
28 418037760
29 402452788967166148425547776
30 116121600

List of values

[1, 6, 72, 120, 5184, 1440, 373248, 6720, 28800, 103680, 1934917632, 80640, 278628139008, 7464960, 2073600, 483840, 1444408272617472, 1612800, 103997395628457984, 5806080, 298598400, 77396705280, 539122498937926189056, 7096320, 1658880000, 5572562780160, 90316800, 418037760, 402452788967166148425547776, 116121600]

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

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