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.

A076230 Numbers k such that sigma_2(k)/k and sigma_4(k)/k are integers.

Table of values

n a(n)
1 1
2 84
3 435708
4 986076
5 1441188
6 6066396
7 7407036
8 16763292
9 18735444
10 78863148
11 260855028
12 318502548
13 1340673516
14 3391115364
15 10829086632
16 45076171140
17 45582899544
18 57648961188
19 77314641768
20 128293717860
21 149098104540
22 174975241896
23 440359518060
24 461191689504

List of values

[1, 84, 435708, 986076, 1441188, 6066396, 7407036, 16763292, 18735444, 78863148, 260855028, 318502548, 1340673516, 3391115364, 10829086632, 45076171140, 45582899544, 57648961188, 77314641768, 128293717860, 149098104540, 174975241896, 440359518060, 461191689504]

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

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