From 8b3d4098625fe8fc4c962796812993aedf893441 Mon Sep 17 00:00:00 2001
From: Stephen Lynn <bizlsg@localhost.localdomain>
Date: Sun, 12 Jun 2022 16:17:37 +0800
Subject:  modified ch-2.jl; tried homeprime(48,65,96)

---
 challenge-168/steve-g-lynn/julia/ch-2.jl | 43 +++++++++++++++++++++++++++++++-
 challenge-168/steve-g-lynn/perl/ch-2.pl  |  8 ++++++
 challenge-168/steve-g-lynn/raku/ch-2.p6  |  7 ++++++
 3 files changed, 57 insertions(+), 1 deletion(-)

diff --git a/challenge-168/steve-g-lynn/julia/ch-2.jl b/challenge-168/steve-g-lynn/julia/ch-2.jl
index 19d4c7d498..0828857250 100755
--- a/challenge-168/steve-g-lynn/julia/ch-2.jl
+++ b/challenge-168/steve-g-lynn/julia/ch-2.jl
@@ -1,15 +1,56 @@
 #! /usr/bin/julia
 
+#time (bash) output: with homeprime.([10,16,20,48,65,96])
+#real	0m41.340s
+#user	0m41.149s
+#sys	0m0.493s
+
+#-- without homeprime(96):
+#real	0m4.744s
+#user	0m4.745s
+#sys	0m0.467s
+
+#-- without .homeprime.([96,65])
+#real	0m1.072s
+#user	0m1.138s
+#sys	0m0.419s
+
+#-- without .homeprime.([96,65,48])
+#real	0m1.002s
+#user	0m1.095s
+#sys	0m0.384s
+
+
+
 using Primes
 
 function homeprime(n::Int64)
+	return homeprime(BigInt(n))
+end
+
+function homeprime(n::BigInt)
 	ncopy=n
 	while (!isprime(ncopy))
-		ncopy=parse(Int64,join(factor(Vector,ncopy)))
+		ncopy=parse(BigInt,join(factor(Vector,ncopy)))
 	end
 	return ncopy
 end
 
+println(homeprime(10))
+#773
+
 println(homeprime(16))
 #31636373
 
+println(homeprime(20))
+#3318308475676071413
+
+println(homeprime(48))
+#6161791591356884791277
+
+println(homeprime(65))
+#1381321118321175157763339900357651
+
+println(homeprime(96))
+#172929671097972226356946608292031596899264419
+
diff --git a/challenge-168/steve-g-lynn/perl/ch-2.pl b/challenge-168/steve-g-lynn/perl/ch-2.pl
index 379ffd9078..0548ac1ebc 100755
--- a/challenge-168/steve-g-lynn/perl/ch-2.pl
+++ b/challenge-168/steve-g-lynn/perl/ch-2.pl
@@ -5,6 +5,14 @@
 #user	0m0.019s
 #sys	0m0.007s
 
+# but this fast time degrades sharply with larger problems
+#
+# real is 0m45.199s if home_prime(48) also printed
+# real is 5m5.662s if home_prime of 48 and 65 also printed
+# real is 8m50.059s if home_prime of 48, 65 and 96 also printed
+#
+# probably some slowdown in factor(.) for factors of very large primes 
+
 use Math::Prime::Util qw(is_prime factor);
 
 print &home_prime(10),"\n";
diff --git a/challenge-168/steve-g-lynn/raku/ch-2.p6 b/challenge-168/steve-g-lynn/raku/ch-2.p6
index 869bc8b3b5..09cbc4412b 100755
--- a/challenge-168/steve-g-lynn/raku/ch-2.p6
+++ b/challenge-168/steve-g-lynn/raku/ch-2.p6
@@ -5,6 +5,13 @@
 #user	0m0.382s
 #sys	0m0.054s
 
+#time if homeprime(48), homeprime(65) and homeprime(96) are also printed:
+#real	2m23.931s
+#user	2m23.527s
+#sys	0m0.071s
+#
+#  ( real 11.512s with homeprime (10,16,20,48,65)
+#    real 0.922s with homeprime (10,16,20,48) )
 
 use Prime::Factor;
 
-- 
cgit