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.

A133033 Number of proper divisors of n-th even perfect number.

Table of values

n a(n)
1 3
2 5
3 9
4 13
5 25
6 33
7 37
8 61
9 121
10 177
11 213
12 253
13 1041
14 1213
15 2557
16 4405
17 4561
18 6433
19 8505
20 8845
21 19377
22 19881
23 22425
24 39873
25 43401
26 46417
27 88993
28 172485
29 221005
30 264097
31 432181
32 1513677
33 1718865
34 2515573
35 2796537
36 5952441
37 6042753
38 13945185
39 26933833
40 41992021
41 48073165
42 51929901
43 60804913

List of values

[3, 5, 9, 13, 25, 33, 37, 61, 121, 177, 213, 253, 1041, 1213, 2557, 4405, 4561, 6433, 8505, 8845, 19377, 19881, 22425, 39873, 43401, 46417, 88993, 172485, 221005, 264097, 432181, 1513677, 1718865, 2515573, 2796537, 5952441, 6042753, 13945185, 26933833, 41992021, 48073165, 51929901, 60804913]

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

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