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Hur kontrollerar jag om antalet är primtal i Excel?

Som vi alla vet är ett primtal ett naturligt tal som bara innehåller två separata naturliga taldelare: en och sig själv. Om du har en lista med siffror i ett kalkylblad, hur kan du kontrollera om siffrorna är primtal?

Kontrollera om ett tal är primtal med matrisformel

Kontrollera om ett tal är primtal med användardefinierad funktion

pil blå höger bubbla Kontrollera om ett tal är primtal med matrisformel

Följande formel kan hjälpa dig att identifiera numret om det är ett primtal eller inte, gör så här:

1. Ange följande formel i en tom cell - C2 till exempel bredvid dina data:

=IF(A2=2,"Prime",IF(AND(MOD(A2,ROW(INDIRECT("2:"&ROUNDUP(SQRT(A2),0))))<>0),"Prime","Not Prime")) (A2 är cellen innehåller det nummer som du vill kontrollera) och tryck sedan på Ctrl + Skift + Enter knapparna tillsammans, så får du resultatet, om siffran är primär, kommer den att visa "Prime" i cellen, om inte, kommer "Not Prime" att visas, se skärmdump:

doc kontrollera om prim 1

2. Välj sedan cellen C2 och dra påfyllningshanteringen ner till cellerna som du vill använda denna formel, och alla siffror kommer att identifieras om det är primtal eller inte. Se skärmdump:

doc kontrollera om prim 2

pil blå höger bubbla Kontrollera om ett tal är primtal med användardefinierad funktion

Följande Användardefinierad funktion kan också hjälpa dig att kontrollera siffrorna om de är primära eller inte, gör så här:

1. Håll ner ALT + F11 nycklar för att öppna Microsoft Visual Basic för applikationer fönster.

2. Klicka Insert > Modulernaoch klistra in följande kod i Modulfönster.

VBA-kod: Kontrollera om ett tal är primt eller inte:

Function CheckPrime(Numb As Single) As Boolean
'Updateby Extendoffice
    Dim X As Long
    If Numb < 2 Or (Numb <> 2 And Numb Mod 2 = 0) _
     Or Numb <> Int(Numb) Then Exit Function
    For X = 3 To Sqr(Numb) Step 2
        If Numb Mod X = 0 Then Exit Function
    Next
    CheckPrime = True
End Function

3. Spara och stäng sedan den här koden, gå tillbaka till kalkylbladet och ange den här formeln: = checkprime (A2) in i en tom cell bredvid din nummerlista och dra sedan påfyllningshanteringen ner till cellerna som du vill innehålla denna formel. Om numret är primtal kommer det att visas SANT, om inte, det visar FALSE, se skärmdump:

doc kontrollera om prim 3

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Comments (21)
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craig
craig
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DO NOT ENTER THE FORMULAE IN THE CELL. Select the cell then paste the formulae in the formulae bar and press ctrl+shft+Enter. it should put { around the formulae} otherwise its wrong.
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ChrisA
ChrisA     craig
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Craig, Thanks - that works! Sorry, I didn't read the instructions sufficiently carefully.
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ChrisA
ChrisA
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There is definitely a problem with this equation. I did a direct copy/paste and checked it was a faithful copy but it still has 9, 15, 21, 25, 33, 35 and 39 as primes when they obviously are not. On quick inspection it seems as if factors of 3 and 5 are giving rise to some sort of problem. It is a very complicated formula for a single cell - so much so, I can't work out what it is trying to do. I usually break such things down into multiple cells to make debugging easier (which, I believe is Excel best practice). The function seems to work, though.
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Chris
Chris
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There is definitely a problem with this equation. I did a direct copy/paste and checked it was a faithful copy but it still has 9, 15, 21, 25, 33, 35 and 39 as primes when they obviously are not. On quick inspection it seems as if factors of 3 and 5 are giving rise to some sort of problem. It is a very complicated formula for a single cell - so much so, I can't work out what it is trying to do. I usually break such things down into multiple cells to make debugging easier (which, I believe is Excel best practice).
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gian_ve
gian_ve
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Hi.

I am using an italian version of Excel, so the formula does not work and i have an error. Can you help me?

Thanks in advance
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skyyang
skyyang     gian_ve
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Hi, Gian,
If the formula does not work correctly for you, you can apply the second method-User Defined Function. Please try, hope it can help you!
Thank you!
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gian_ve
gian_ve     skyyang
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Hi skyyang.
If it can be useful for others researchers, I inform you that I have found the solution to my problem here => http://www.riolab.org/index.php?option=com_content&view=article&id=172&Itemid=68

Thank you!
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Kiran
Kiran
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Yes it worked wen I did Ctrl+Shift+Enter... !! Thank you..:D and Do u mind explaining the algorithm please.
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Nathan
Nathan
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There's a reference error when you type in numbers that have more than 12 digits.
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skyyang
skyyang     Nathan
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Hello,Nathan,
As you said, when the numbers are longer than 12 digits, it will become scientific notation. The formula is not applied for this formatting.
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vaibhav
vaibhav
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well 4095 is not a prime. still it gives result as prime no though. its incorrect.
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skyyang
skyyang     vaibhav
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Hello, vaibhav,
When you pasting above formula, you should press Ctrl + Shift + Enter keys together, not just Enter key, please try it again.
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xsoft.cz@gmail.com
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Your formula is not working. Eg. 1681 is NOT a prime but by formula it is.
=IF(A2=2,"Prime",IF(AND(MOD(A2,ROW(INDIRECT("2:"&ROUNDUP(SQRT(A2),0))))<>0),"Prime","Not Prime"))
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skyyang
skyyang    
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Hello, Jan,
The above formula is correct, after pastingt the formula into a cell, you should press Ctrl + Shift + Enter keys together, not just Enter key.
Please try it again, thank you!
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xsoft.cz@gmail.com
    skyyang
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Yes, it was that case with CSE. Thanks (it's fixed now).
https://superuser.com/questions/674566/when-to-use-ctrlshiftenter-and-when-to-use-enter-in-excel

Btw Czech variant to:
=IF(A2=2,"Prime",IF(AND(MOD(A2,ROW(INDIRECT("2:"&ROUNDUP(SQRT(A2),0))))<>0),"Prime","Not Prime"))
is:
=KDYŽ(A2=2;"Prime";KDYŽ(A(MOD(A2;ŘÁDEK(NEPŘÍMÝ.ODKAZ("2:"&ROUNDUP(ODMOCNINA(A2);0))))<>0);"Prime";"Not Prime"))

Compare: https://imgur.com/a/4MgeV
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John Kennedy Aquino
John Kennedy Aquino
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this is my fastest version Sub generateprimenumbersbetween3() starting_number = 1 'input value here last_number = 30000 'input value here primenumbers = "" For a = starting_number To last_number c = a For b = 2 To c If a Mod b = 0 And c b Then Exit For Else If b = c Then primenumbers = primenumbers & " " & a Exit For Else If Round(a / (b + 1)) + 1 > b Then c = Round(a / (b + 1)) + 1 End If End If End If Next b Next a MsgBox primenumbers End Sub Sub ISPRIME3() number_to_be_checked = 2000000000 'input value here c = number_to_be_checked For b = 2 To c If number_to_be_checked Mod b = 0 And c b Then MsgBox "Not Prime. Divisible by " & b Exit Sub Else If b = c Then MsgBox "Prime" Exit Sub Else If Round(number_to_be_checked / (b + 1)) + 1 > b Then c = Round(number_to_be_checked / (b + 1)) + 1 End If End If End If Next b End Sub
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Rick
Rick
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The user defined function does not seem to work for numbers above ~16777213
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John Kennedy Aquino
John Kennedy Aquino     Rick
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Sub generateprimenumbersbetween() starting_number = 99990 'input value here last_number = 99999 'input value here primenumbers = "" For a = starting_number To last_number For b = 2 To a If a - b * Int(a / b) = 0 And a b Then Exit For Else If a = b Then primenumbers = primenumbers & " " & a End If End If Next b Next a MsgBox primenumbers End Sub Function primenumbersbetween(starting_number, last_number) primenumbers = "" For a = starting_number To last_number For b = 2 To a If a - b * Int(a / b) = 0 And a b Then Exit For Else If a = b Then primenumbers = primenumbers & " " & a End If End If Next b Next a primenumbersbetween = primenumbers End Function 'to check if a number is prime Sub ISPRIME() number_to_be_checked = 102 'input value here For b = 2 To number_to_be_checked If number_to_be_checked - b * Int(number_to_be_checked / b) = 0 And _ number_to_be_checked b Then MsgBox "Not Prime. Divisible by " & b Exit Sub Else If number_to_be_checked = b Then MsgBox "Prime" End If End If Next b End Sub 'to check if a number is prime Function ISPRIME2(number_to_be_checked) For b = 2 To number_to_be_checked If number_to_be_checked - b * Int(number_to_be_checked / b) = 0 And _ number_to_be_checked b Then ISPRIME2 = "Not Prime. Divisible by " & b Exit Function Else If number_to_be_checked = b Then ISPRIME2 = "Prime" End If End If Next b End Function
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