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lambda n,k:sum(range(1+kk,0,-n)[:)
Try it online!
Thanks to totallyhuman for -3 bytes!
f=lambda n,k:k>0and k+f(n,k-n]n)
Try it online!Try it online!
lambda n,k:sum(range(1+k)[::-n])
lambda n,k:sum(range(k,0,-n))
f=lambda n,k:k>0and k+f(n,k-n)
