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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.

A253825 Numbers m = concat(s,t) such that m = (sigma(s)-s) * (sigma(t)-t), where sigma(x)-x is the sum of the aliquot parts of x.

Table of values

n a(n)
1 6396
2 20680
3 124416
4 567816
5 1719480
6 7593432
7 10538040
8 36382320
9 107277800
10 123251968
11 166601760
12 327844840
13 933363000
14 1286859804
15 2524125184
16 3398418000
17 4561432920
18 4566915540
19 4911440776
20 7097433536
21 16913792670
22 20565608940
23 21099997800
24 27639552000

List of values

[6396, 20680, 124416, 567816, 1719480, 7593432, 10538040, 36382320, 107277800, 123251968, 166601760, 327844840, 933363000, 1286859804, 2524125184, 3398418000, 4561432920, 4566915540, 4911440776, 7097433536, 16913792670, 20565608940, 21099997800, 27639552000]

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

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