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Revision History for A333789 (Bold, blue-underlined text is an addition; faded, red-underlined text is a deletion.)

Showing entries 1-10 | older changes
Numbers k for which A333790(k) < A073934(k).
(history; published version)
#16 by Michel Marcus at Wed Apr 15 12:30:07 EDT 2020
STATUS

reviewed

approved

#15 by Wesley Ivan Hurt at Wed Apr 15 12:29:45 EDT 2020
STATUS

proposed

reviewed

#14 by Michael De Vlieger at Wed Apr 15 11:52:00 EDT 2020
STATUS

editing

proposed

#13 by Michael De Vlieger at Wed Apr 15 11:51:57 EDT 2020
MATHEMATICA

Block[{a, b, nn = 1122}, a = Min@ Map[Total, #] & /@ Nest[Function[{a, n}, Append[a, Join @@ Table[Flatten@ Prepend[#, n] & /@ a[[n - n/p]], {p, FactorInteger[n][[All, 1]]}]]] @@ {#, Length@ # + 1} &, {{{1}}}, nn]; b = Array[If[# == 1, 1, Total@ NestWhileList[If[PrimeQ@ #, # - 1, # - #/FactorInteger[#][[1, 1]] ] &, #, # > 1 &]] &, nn]; Select[Range@ nn, a[[#]] < b[[#]] &]] (* Michael De Vlieger, Apr 15 2020 *)

STATUS

approved

editing

#12 by Susanna Cuyler at Sun Apr 12 21:45:01 EDT 2020
STATUS

proposed

approved

#11 by Antti Karttunen at Sun Apr 12 16:49:53 EDT 2020
STATUS

editing

proposed

#10 by Antti Karttunen at Sun Apr 12 16:20:25 EDT 2020
COMMENTS

Numbers n for which the {smallest path sum when iterating from n to 1 with nondeterministic map k -> k - k/p, where p is any prime factor of k} cannot be obtained by always selecting the smallest prime factor of k (A020639). See the example in A333790 how that simple heuristics heuristic fails when starting from k=119.

#9 by Antti Karttunen at Sun Apr 12 16:17:15 EDT 2020
COMMENTS

Numbers n for which the {smallest path sum when iterating from n to 1 with nondeterministic map k -> k - k/p, where p is any prime factor of k} cannot be obtained by always selecting the smallest prime factor of k (A020639). See the example in A333790 how that simple heuristic heuristics fails when starting from k=119.

#8 by Antti Karttunen at Sun Apr 12 12:12:11 EDT 2020
COMMENTS

Numbers n for which the {smallest path sum when iterating from n to 1 with nondeterministic map k -> k - k/p, where p is any prime factor of k, } cannot be obtained by always selecting the smallest prime factor of k (A020639). See the example in A333790 how that simple heuristic fails when starting from k=119.

#7 by Antti Karttunen at Sun Apr 12 12:01:32 EDT 2020
COMMENTS

Numbers n for which the smallest path sum when iterating from n to 1 with nondeterministic map k -> k - k/p, where p is any prime factor of k, cannot be obtained by always selecting the smallest prime factor of k (A020639). See the example in A333790 how that simple heuristic fails, when starting from k=119.