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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.

A357842 a(n) is the smallest number k for which k and the arithmetic derivative k' (A003415) have exactly n triangular divisors (A000217).

Table of values

n a(n)
1 2
2 27
3 18
4 72
5 612
6 1764
7 756
8 8100
9 27000
10 97200
11 66528
12 175500
13 93600
14 280800
15 1731600
16 661500
17 680400
18 3704400
19 34177500
20 11107800
21 16581600
22 20065500
23 108486000
24 102910500
25 108353700
26 181912500
27 314874000
28 462672000
29 4408236000
30 229975200
31 2297786400
32 672348600
33 925041600
34 1344697200
35 158230800

List of values

[2, 27, 18, 72, 612, 1764, 756, 8100, 27000, 97200, 66528, 175500, 93600, 280800, 1731600, 661500, 680400, 3704400, 34177500, 11107800, 16581600, 20065500, 108486000, 102910500, 108353700, 181912500, 314874000, 462672000, 4408236000, 229975200, 2297786400, 672348600, 925041600, 1344697200, 158230800]

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

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