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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.

A128281 a(n) is the least product of n distinct odd primes m=p_1*p_2*...*p_n, such that (d+m/d)/2 are all primes for each d dividing m.

Table of values

n a(n)
1 3
2 21
3 105
4 1365
5 884037

List of values

[3, 21, 105, 1365, 884037]

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

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