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.

A348031 Multiply-perfect numbers k that have a divisor d such that sigma(d)*d = k.

Table of values

n a(n)
1 1
2 6
3 28
4 120
5 496
6 672
7 8128
8 30240
9 32760
10 523776
11 23569920
12 33550336
13 142990848
14 1379454720
15 8589869056
16 66433720320
17 137438691328
18 153003540480
19 403031236608
20 14942123276641920
21 275502900594021408
22 2305843008139952128
23 71065075104190073088
24 154345556085770649600
25 203820700083634254643200
26 34384125938411324962897920

List of values

[1, 6, 28, 120, 496, 672, 8128, 30240, 32760, 523776, 23569920, 33550336, 142990848, 1379454720, 8589869056, 66433720320, 137438691328, 153003540480, 403031236608, 14942123276641920, 275502900594021408, 2305843008139952128, 71065075104190073088, 154345556085770649600, 203820700083634254643200, 34384125938411324962897920]

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

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