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.

A328120 Exponential superperfect numbers (or e-superperfect numbers): numbers m such that esigma(esigma(m)) = 2m, where esigma(m) is the sum of exponential divisors of m (A051377).

Table of values

n a(n)
1 9
2 12
3 45
4 60
5 63
6 84
7 99
8 117
9 132
10 153
11 156
12 171
13 204
14 207
15 228
16 261
17 270
18 276
19 279
20 315
21 333
22 348
23 369
24 372
25 387
26 420
27 423
28 444
29 477
30 492
31 495
32 516
33 531
34 549
35 564
36 585
37 603
38 636
39 639
40 657
41 660
42 693
43 708
44 711
45 732
46 747
47 765
48 780
49 801
50 804
51 819
52 852
53 855
54 873

List of values

[9, 12, 45, 60, 63, 84, 99, 117, 132, 153, 156, 171, 204, 207, 228, 261, 270, 276, 279, 315, 333, 348, 369, 372, 387, 420, 423, 444, 477, 492, 495, 516, 531, 549, 564, 585, 603, 636, 639, 657, 660, 693, 708, 711, 732, 747, 765, 780, 801, 804, 819, 852, 855, 873]

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

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