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.

A056153 Leading least prime signatures: a(n) is in A025487 but a(n)/2 is not.

Table of values

n a(n)
1 1
2 6
3 30
4 36
5 180
6 210
7 216
8 900
9 1080
10 1260
11 1296
12 2310
13 5400
14 6300
15 6480
16 7560
17 7776
18 13860
19 27000
20 30030
21 32400
22 37800
23 38880
24 44100
25 45360
26 46656
27 69300
28 83160
29 162000
30 180180
31 189000
32 194400
33 226800
34 233280
35 264600
36 272160
37 279936

List of values

[1, 6, 30, 36, 180, 210, 216, 900, 1080, 1260, 1296, 2310, 5400, 6300, 6480, 7560, 7776, 13860, 27000, 30030, 32400, 37800, 38880, 44100, 45360, 46656, 69300, 83160, 162000, 180180, 189000, 194400, 226800, 233280, 264600, 272160, 279936]

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

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