primes

package

v0.16.0 Latest Latest Go to latest Published: Oct 25, 2025 License: MIT Imports: 5 Imported by: 0

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Valid go.mod file
Redistributable license
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Stable version
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Repository

github.com/erikbryant/util-golang

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Documentation ¶

Index ¶

Variables
func Load(fName string) []int
func MakePrimes(maxPrime int) []int
func PackedIndex(n int) int
func Pi(n int) int
func Prime(number int) bool
func Save(primes []int)
func SlowPrime(n int) bool

Constants ¶

This section is empty.

Variables ¶

View Source

var (
	// Primes is a list of the first n prime numbers
	Primes []int
	// PrimesEnd is the index of the final value in the Primes slice
	PrimesEnd int
)

Functions ¶

func Load ¶

func Load(fName string) []int

Load returns the contents of the gob file as an int slice

func MakePrimes ¶ added in v0.16.0

func MakePrimes(maxPrime int) []int

MakePrimes returns all primes <= maxPrime

func PackedIndex ¶

func PackedIndex(n int) int

PackedIndex returns the index in Primes of n, or -1 if not found

func Pi ¶

func Pi(n int) int

Pi is the prime counting function, returning the number of primes below n https://en.wikipedia.org/wiki/Prime-counting_function

func Prime ¶

func Prime(number int) bool

Prime returns true if number is prime

func Save ¶

func Save(primes []int)

Save writes an int slice to the gob file

func SlowPrime ¶

func SlowPrime(n int) bool

SlowPrime returns whether a number is prime or not, using a brute force search

Types ¶

This section is empty.

Source Files ¶

View all Source files

primes.go

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