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.

A097905 Triangle where a(m,n) = largest divisor of m! coprime to n.

Original entry on oeis.org

1, 2, 1, 6, 3, 2, 24, 3, 8, 3, 120, 15, 40, 15, 24, 720, 45, 80, 45, 144, 5, 5040, 315, 560, 315, 1008, 35, 720, 40320, 315, 4480, 315, 8064, 35, 5760, 315, 362880, 2835, 4480, 2835, 72576, 35, 51840, 2835, 4480, 3628800, 14175, 44800, 14175, 145152, 175
Offset: 1

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Author

Leroy Quet, Sep 04 2004, Apr 10 2007

Keywords

Comments

Right edge of triangle is sequence A095996.

Examples

			a(6,3) = 80 because 80 is largest divisor of 720 which is coprime to 3.
		

Crossrefs

Cf. A095996.

Programs

  • Maple
    seq(seq(denom(m^n/n!),m=1..n),n=1..11); # Vladeta Jovovic, May 03 2005
  • Mathematica
    Flatten[Table[Table[Select[Divisors[m! ], GCD[ #,n]==1&][[ -1]], {n,1,m}],{m,1, 10}]] (* Stefan Steinerberger, Nov 09 2007 *)

Extensions

More terms from Stefan Steinerberger, Nov 09 2007