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.

A368242 Numbers k whose number of proper divisors is greater than sqrt(k).

Original entry on oeis.org

6, 8, 12, 18, 20, 24, 30, 36, 40, 42, 48, 60, 72, 80, 84, 90, 96, 108, 120, 144, 168, 180, 210, 216, 240, 252, 288, 336, 360, 420, 480, 504, 720, 840
Offset: 1

Views

Author

Zdenek Cervenka, Dec 18 2023

Keywords

Crossrefs

Programs

  • Mathematica
    Select[Range[1, 10000000], Length[Divisors[#]] - 1 > Sqrt[#] &]
  • PARI
    for(k=1,10^6,if(numdiv(k)-1 > sqrtint(k), print1(k,", "))) \\ Joerg Arndt, Jan 06 2024

Formula

12 is a term since it has 5 proper divisors (1,2,3,4,6), and 5 > sqrt(12).