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.

A383364 a(n) is the least number k with exactly n proper divisors, where all of them have binary weights that are different from the binary weight of k.

Table of values

n a(n)
0 1
1 3
2 25
3 15
4 81
5 63
6 15625
7 231
8 1225
9 405
10 59049
11 495
12 531441
13 5103
14 2025
15 1485
16 33232930569601
17 2475
18 3814697265625
19 6237
20 18225
21 295245
22 31381059609
23 4095
24 1500625
25 2657205
26 81225
27 25515
28 22876792454961
29 14175
30 931322574615478515625
31 21735
32 31236921
33 301327047

List of values

[1, 3, 25, 15, 81, 63, 15625, 231, 1225, 405, 59049, 495, 531441, 5103, 2025, 1485, 33232930569601, 2475, 3814697265625, 6237, 18225, 295245, 31381059609, 4095, 1500625, 2657205, 81225, 25515, 22876792454961, 14175, 931322574615478515625, 21735, 31236921, 301327047]

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

Content is available under The OEIS End-User License Agreement.