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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
199093 changed files with 3378972 additions and 0 deletions
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15
Task/Truncatable-primes/Zkl/truncatable-primes-1.zkl Normal file
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const million=0d1_000_000;
var pTable=Data(million+1,Int).fill(0); // actually bytes, all zero
primes:=Utils.Generator(Import("sieve").postponed_sieve);
while((p:=primes.next())<million){ pTable[p]=1; }
fcn rightTrunc(n){
while(n){ if(not pTable[n]) return(False); n/=10; }
True
}
fcn leftTrunc(n){ // 999,907 is not allowed
ns:=n.toString(); if (ns.holds("0")) return(False);
while(ns){ if(not pTable[ns]) return(False); ns=ns[1,*]; }
True
}

4
Task/Truncatable-primes/Zkl/truncatable-primes-2.zkl Normal file
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[million..0,-1].filter1(rightTrunc):
"%,d is a right truncatable prime".fmt(_).println();
[million..0,-1].filter1(leftTrunc):
"%,d is a left truncatable prime".fmt(_).println();