The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A156821 Prime factors of 13! listed with multiplicity. 0
 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 5, 5, 7, 11, 13 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Table of n, a(n) for n=1..20. EXAMPLE 13! = 2^10 * 3^5 * 5^2 * 7 * 11 * 13. From Vincenzo Librandi, Jun 13 2014: (Start) Floor(13/2) = 6, floor(13/4) = 3, floor(13/8) = 1; 6 + 3 + 1 = 10 -> 2^10. Floor(13/3) = 4, floor(13/9) = 1; 4 + 1 = 5 -> 3^5. Floor(13/5) = 2 -> 5^2. Floor(13/7) = 1 -> 7. Floor(13/11) = 1 -> 11. 13/13 = 1 -> 13. (End) MATHEMATICA Flatten[Table[#[[1]], {#[[2]]}] & /@ FactorInteger[13!]] (* Alonso del Arte, Jun 14 2014, based on Jean-François Alcover's program for A027746 *) CROSSREFS Sequence in context: A061217 A102684 A337637 * A025856 A350765 A103378 Adjacent sequences: A156818 A156819 A156820 * A156822 A156823 A156824 KEYWORD nonn,fini,full AUTHOR Vincenzo Librandi, Feb 16 2009 EXTENSIONS Edited for clarity by Jon E. Schoenfield, Jun 18 2010 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified May 18 16:32 EDT 2024. Contains 372664 sequences. (Running on oeis4.)