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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
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
KEYWORD
nonn,fini,full
AUTHOR
Vincenzo Librandi, Feb 16 2009
EXTENSIONS
Edited for clarity by Jon E. Schoenfield, Jun 18 2010
STATUS
approved

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