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.

A369420 Powerful numbers k that are not prime powers, such that k has a primorial kernel but is not a product of primorials.

Table of values

n a(n)
1 108
2 324
3 648
4 972
5 1944
6 2700
7 2916
8 3888
9 4500
10 5832
11 8100
12 8748
13 9000
14 11664
15 13500
16 16200
17 17496
18 18000
19 22500
20 23328
21 24300
22 26244
23 34992
24 36000
25 40500
26 45000
27 48600
28 52488
29 67500
30 69984
31 72000
32 72900
33 78732
34 81000
35 90000
36 97200
37 104976
38 112500
39 121500
40 132300

List of values

[108, 324, 648, 972, 1944, 2700, 2916, 3888, 4500, 5832, 8100, 8748, 9000, 11664, 13500, 16200, 17496, 18000, 22500, 23328, 24300, 26244, 34992, 36000, 40500, 45000, 48600, 52488, 67500, 69984, 72000, 72900, 78732, 81000, 90000, 97200, 104976, 112500, 121500, 132300]

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

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