data/problems/207.yml
---
:id: 207
:name: Integer partition equations
:url: https://projecteuler.net/problem=207
:content: "For some positive integers <var>k</var>, there exists an integer partition
of the form 4<sup>t</sup> = 2<sup>t</sup> + <var>k</var>, \nwhere 4<sup>t</sup>,
2<sup>t</sup>, and <var>k</var> are all positive integers and <var>t</var> is a
real number.\n\nThe first two such partitions are 4<sup>1</sup> = 2<sup>1</sup>
+ 2 and 4<sup>1.5849625...</sup> = 2<sup>1.5849625...</sup> + 6.\n\nPartitions where
<var>t</var> is also an integer are called _perfect_. \n For any <var>m</var> ≥
1 let P(<var>m</var>) be the proportion of such partitions that are perfect with
<var>k</var> ≤ <var>m</var>. \nThus P(6) = 1/2.\n\nIn the following table are listed
some values of P(<var>m</var>)\n\n P(5) = 1/1 \n P(10)
= 1/2 \n P(15) = 2/3 \n P(20) = 1/2 \n P(25)
= 1/2 \n P(30) = 2/5 \n ... \n P(180)
= 1/4 \n P(185) = 3/13\n\nFind the smallest <var>m</var> for which
P(<var>m</var>) \\< 1/12345\n\n"