The Bernoulli numerator N_188 of B_188 was factored by ECM as
P77*P117 on June 15, 2013.
At the time, the P77 was the second largest prime factor ever
found by the elliptic curve method.
Sam Wagstaff
GMP-ECM 6.4 [configured with GMP 5.0.2, --enable-asm-redc] [ECM]
Input number is 5643628381904772432986471131442539930981837197676375094790019141128201787744231533891883292694411411427751862864804392390540862336394358260656630190490837761850399583189901649231716896503003879 (193 digits)
Using B1=1000000000, B2=19071176724616, polynomial Dickson(30), sigma=366329389
Step 1 took 6636446ms
Step 2 took 1114281ms
********** Factor found in step 2: 18974159366624817405627752670504479132613571595050983959444958694223874973021
Found probable prime factor of 77 digits: 18974159366624817405627752670504479132613571595050983959444958694223874973021
Probable prime cofactor 297437597780052726305608051037291442478323870675941036015394655347131011454196950930115200163093497696549106902298899 has 117 digits
Report your potential champion to Richard Brent
(see http://wwwmaths.anu.edu.au/~brent/ftp/champs.txt)