Improved nth Prime (#142) #51

Job	Run time
linux_gcc_valgrind	1m 18s
linux_gcc (ubuntu-latest, Debug)	4m 34s
linux_clang (ubuntu-latest, Debug)	3m 35s
linux_gcc_sanitizers	2m 55s
linux_gcc (ubuntu-latest, Release)	2m 46s
linux_clang (ubuntu-latest, Release)	1m 15s
macos_clang (macos-latest, Debug)	5m 26s
windows_mingw64 (windows-latest, Debug)	5m 31s
macos_clang (macos-latest, Release)	2m 13s
windows_msvc2022	2m 27s
windows_mingw64 (windows-latest, Release)	2m 55s
	34m 55s

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