Rn1

rn1(x,y)
Probability mass function of rn1(10,5).
Distribution	uniform
Mean	$(x-1)/2+y$
Standard deviation	$\sqrt{(x^2-1)/12}$

rn1(x, y) is a pseudo-random number macro used in NetHack when a result should be unweighted. It is equivalent to rn2(x) + y. The range of values is between y and y+x-1 inclusive (that is, y<=rn1(x,y)<x+y).

See also rn2.

References

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