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.

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A137582 Numbers having no inner zeros in decimal representation of their factorial.

Original entry on oeis.org

0, 1, 2, 3, 4, 5, 6, 9, 10, 11, 14, 31, 40
Offset: 1

Views

Author

Reinhard Zumkeller, Jan 27 2008

Keywords

Comments

Conjecture: the sequence is finite.

Examples

			A000142(a(10)) = 11! = 399168*10^2;
A000142(a(11)) = 14! = 871782912*10^2;
A000142(a(12)) = 31! = 822283865417792281772556288*10^7.
		

Crossrefs

Programs

  • PARI
    isok(k) = my(f=k!); while(!(f % 10), f \= 10); #select(x->(x == 0), digits(f)) == 0; \\ Michel Marcus, Jun 28 2023

Formula

A137581(a(n)) = 0.
Showing 1-1 of 1 results.