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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.

A309378 a(n) is the smallest squarefree number m with n prime factors such that Sum_{prime q|m} 1/q - 1/m = P/Q, where P <> Q are primes, for n > 1, or a(n) = 1 if no such m.

Table of values

n a(n)
1 1
2 6
3 105
4 1330
5 331230
6 4081530
7 127357230

List of values

[1, 6, 105, 1330, 331230, 4081530, 127357230]

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

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