20200901, 05:31  #1 
Sep 2019
8_{10} Posts 
Smallest composite without known factors "stuck" on (10^79181)%(10^791)/9
The "Smallest composite without known factors" on the status page often points to http://factordb.com/index.php?id=1100000000900935563, but that number is actually prime.
Is it possible to fix that entry so that we can see the real smallest unfactored number? 
20200901, 09:21  #2 
"Oliver"
Sep 2017
Porta Westfalica, DE
2×7×29 Posts 
It thinks that 1551548344191988309623860115843108935500421 is a factor of that number for some reason. Maybe it thinks it is composite because it evaluates the expression to 1111111111111111111111111111111111111111111111111111111111111111111111111110931 and not 1111111111111111111111111111111111111111111111111111111111111111111111111111091?

20200901, 09:28  #3 
Undefined
"The unspeakable one"
Jun 2006
My evil lair
176C_{16} Posts 
There is a duplicate entry:
http://factordb.com/index.php?id=1100000000902314000 
20200901, 11:43  #4 
"Jeppe"
Jan 2016
Denmark
2^{2}×41 Posts 
There must be or have been some inconsistence on how the precedence is when the parentheses are not explicit.
If you type (10^79181)%((10^791)/9) you come to the fully factored 79digit composite number: http://factordb.com/index.php?id=1100000000900937469 If you type ((10^79181)%(10^791))/9 you come to the 79digit prime: http://factordb.com/index.php?id=1100000000902314000 Both these entries are entirely correct. However, the entry you link: http://factordb.com/index.php?id=1100000000900935563 seems to be a mixup of the two interpretations. It has evaluated to "C" (composite). But when you click Show digits, you see the expansion for the 79digit prime. I speculate that one piece of code in factordb sees the expression in one way, and another place sees it in the other way, and we have this mixup. The schizophrenic entry needs to be removed, and (if not fixed already) the operator precedence convention must be consequent. /JeppeSN 
Thread Tools  
Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Is "mung" or "munged" a negative word in a moral sense?  Uncwilly  Lounge  15  20200414 18:35 
How much smaller can "primitive" factors be?  jshort  Other Mathematical Topics  5  20191221 16:19 
"factors.txt.u1conflict..." files  Flatlander  Linux  3  20110221 02:32 
"On factors of Mersenne numbers"  Seiji Tomita  cheesehead  Math  6  20091215 17:45 
Would Minimizing "iterations between results file" may reveal "is not prime" earlier?  nitai1999  Software  7  20040826 18:12 