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.

A281623 Numbers of the form 2^phi(m) + 1, where phi = A000010 = Euler totient function.

Table of values

n a(n)
1 3
2 5
3 17
4 65
5 257
6 1025
7 4097
8 65537
9 262145
10 1048577
11 4194305
12 16777217
13 268435457
14 1073741825
15 4294967297
16 68719476737
17 1099511627777
18 4398046511105
19 17592186044417
20 70368744177665
21 281474976710657
22 4503599627370497
23 18014398509481985
24 72057594037927937

List of values

[3, 5, 17, 65, 257, 1025, 4097, 65537, 262145, 1048577, 4194305, 16777217, 268435457, 1073741825, 4294967297, 68719476737, 1099511627777, 4398046511105, 17592186044417, 70368744177665, 281474976710657, 4503599627370497, 18014398509481985, 72057594037927937]

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

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