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.

A348867 Numbers whose numerator and denominator of the harmonic mean of their divisors are both 3-smooth numbers.

Table of values

n a(n)
1 1
2 2
3 3
4 6
5 28
6 40
7 84
8 120
9 135
10 224
11 270
12 672
13 819
14 1638
15 3780
16 10880
17 13392
18 30240
19 32640
20 32760
21 167400
22 950976
23 1303533
24 2178540
25 2607066
26 3138345
27 4713984
28 6276690
29 8910720
30 14705145
31 17428320
32 29410290
33 45532800
34 52141320
35 179734464
36 301953024
37 311323824

List of values

[1, 2, 3, 6, 28, 40, 84, 120, 135, 224, 270, 672, 819, 1638, 3780, 10880, 13392, 30240, 32640, 32760, 167400, 950976, 1303533, 2178540, 2607066, 3138345, 4713984, 6276690, 8910720, 14705145, 17428320, 29410290, 45532800, 52141320, 179734464, 301953024, 311323824]

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

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