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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.

A338405 a(n) is the smallest number with exactly n divisors d such that sigma(d)/d is an integer.

Table of values

n a(n)
1 1
2 6
3 84
4 672
5 3360
6 30240
7 393120
8 12186720
9 164989440
10 14024102400
11 2144862720
12 182313331200
13 5705334835200
14 96990692198400
15 187409525022720
16 9602078527641600
17 124627334140108800
18 2118664680381849600
19 19067982123436646400
20 209747803357803110400
21 3985208263798259097600
22 63343836614056539340800
23 401177631889024749158400
24 1203532895667074247475200

List of values

[1, 6, 84, 672, 3360, 30240, 393120, 12186720, 164989440, 14024102400, 2144862720, 182313331200, 5705334835200, 96990692198400, 187409525022720, 9602078527641600, 124627334140108800, 2118664680381849600, 19067982123436646400, 209747803357803110400, 3985208263798259097600, 63343836614056539340800, 401177631889024749158400, 1203532895667074247475200]

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

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