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0k=>0.to(k).flatMap(i=>0.to(k).filter(j=>i*i+j*j+i*j==k).map((i,_)->))
Try it online!Try it online!
Thanks to user for -2
0.to(k).flatMap(i=>0.to(k).filter(j=>i*i+j*j+i*j==k).map((i,_)))
Try it online!
k=>0.to(k)flatMap(i=>0.to(k)filter(j=>i*i+j*j+i*j==k)map(i->))
