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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.

A330251 Numbers k such that phi(k) = phi(k+3), where phi (A000010) is Euler's totient function.

Table of values

n a(n)
1 3
2 5
3 8720288051472
4 9134280520365
5 41544070492925
6 42466684755492
7 51363581614342
8 68616494581632
9 113312918293575
10 210911076210835
11 215517565688425
12 294988451482725
13 383617980270525
14 432759876053505
15 442863123838135
16 532068058516992
17 892813363927485
18 923102743748185
19 929531173876305

List of values

[3, 5, 8720288051472, 9134280520365, 41544070492925, 42466684755492, 51363581614342, 68616494581632, 113312918293575, 210911076210835, 215517565688425, 294988451482725, 383617980270525, 432759876053505, 442863123838135, 532068058516992, 892813363927485, 923102743748185, 929531173876305]

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

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