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Problem 576


Problem 576


Irrational jumps

A bouncing point moves counterclockwise along a circle with circumference 1 with jumps of constant length l<1, until it hits a gap of length g<1, that is placed in a distance d counterclockwise from the starting point. The gap does not include the starting point, that is g+d<1.

Let S(l,g,d) be the sum of the length of all jumps, until the point falls into the gap. It can be shown that S(l,g,d) is finite for any irrational jump size l, regardless of the values of g and d.
Examples:
S(12,0.06,0.7)=0.7071, S(12,0.06,0.3543)=1.4142 and
S(12,0.06,0.2427)=16.2634.

Let M(n,g) be the maximum of S(1p,g,d) for all primes pn and any valid value of d.
Examples:
M(3,0.06)=29.5425, since S(12,0.06,0.2427)+S(13,0.06,0.2427)=29.5425 is the maximal reachable sum for g=0.06.
M(10,0.01)=266.9010

Find M(100,0.00002), rounded to 4 decimal places.


无理数跳跃

一个点沿着周长为1的圆周逆时针跳跃,每次跳跃的长度为固定值l<1,直至其落入一个距离起始位置逆时针距离为d、长度为g<1的间隙中为止。这段间隙不会包括起始位置,也就是说g+d<1

S(l,g,d)为这个点掉入间隙之前所跳跃的总长度。可以证明,当跳跃的步长l是无理数时,无论gd取什么值,S(l,g,d)都是有限的。
例如:
S(12,0.06,0.7)=0.7071S(12,0.06,0.3543)=1.4142以及
S(12,0.06,0.2427)=16.2634

M(n,g)为任取合理的d时,对所有素数pnS(1p,g,d)的最大值。
例如:
M(3,0.06)=29.5425,因为S(12,0.06,0.2427)+S(13,0.06,0.2427)=29.5425g=0.06时能达到的最大值。
M(10,0.01)=266.9010

M(100,0.00002),并保留4位小数。


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