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.

A180615 Numbers starting with 1 such that the sum of any two distinct elements has an odd number of distinct prime factors.

Table of values

n a(n)
1 1
2 2
3 3
4 6
5 58
6 124
7 254
8 309
9 519
10 1029
11 1179
12 1569
13 1986
14 3795
15 10008
16 31133
17 39260
18 76772
19 126798
20 190293
21 613553
22 873413
23 1324947
24 16893137
25 23186977
26 65348522
27 91513433
28 168375480
29 836588442
30 844570409

List of values

[1, 2, 3, 6, 58, 124, 254, 309, 519, 1029, 1179, 1569, 1986, 3795, 10008, 31133, 39260, 76772, 126798, 190293, 613553, 873413, 1324947, 16893137, 23186977, 65348522, 91513433, 168375480, 836588442, 844570409]

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

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