optimized sieving parameters for c270 (based on RSA896)
optimized sieving parameters for c270 (based on RSA896)

With I=18 we assume we will find 4 times more relations than with I=16, thus
we used OPAL with I=16, and did target 25% of the required relations.

mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs