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Old 2021-02-01, 22:25   #511
unconnected
 
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May 2009
Russia, Moscow

50028 Posts
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Lucky find for near-repdigit number (74*10^283+7)/9:
Code:
Using B1=3000000, B2=5706890290, polynomial Dickson(6), sigma=1:949432216
Step 1 took 9528ms
Step 2 took 4729ms
********** Factor found in step 2: 1182219105908711587346038374813771128564935992167
Found prime factor of 49 digits: 1182219105908711587346038374813771128564935992167
Prime cofactor 472167911435767590384937592650265763333570374651435418184918818066214429283320719814902198706039980988613407949105532565490068110752657746342543 has 144 digits
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