Preskoči na glavno vsebino

Kako preveriti, ali je številka glavno število v Excelu?

Kot že vsi vemo, je praštevilo naravno število, ki vsebuje le dva ločena delitelja naravnega števila: Enega in samega sebe. Če imate na delovnem listu seznam števil, kako lahko preverite, ali so številke praštevila?

Preverite, ali je število prvo število s formulo matrike

Z uporabniško določeno funkcijo preverite, ali je številka glavno število


puščica modri desni mehurček Preverite, ali je število prvo število s formulo matrike

Naslednja formula vam lahko pomaga prepoznati številko, ali je prvo število ali ne, naredite tako:

1. V prazno celico vnesite naslednjo formulo - na primer C2 poleg svojih podatkov:

=IF(A2=2,"Prime",IF(AND(MOD(A2,ROW(INDIRECT("2:"&ROUNDUP(SQRT(A2),0))))<>0),"Prime","Not Prime")) (A2 je celica vsebuje številko, ki jo želite preveriti) in pritisnite Ctrl + Shift + Enter tipke skupaj in dobili boste rezultat, če je številka osnovna, bo v celici prikazana oznaka »Prime«, v nasprotnem primeru bo prikazana oznaka »Not Prime«, glejte posnetek zaslona:

doc preveri, če je prime 1

2. Nato izberite celico C2 in povlecite ročico za polnjenje navzdol do celic, za katere želite uporabiti to formulo, in vse številke bodo prepoznane, če je glavno število ali ne. Oglejte si posnetek zaslona:

doc preveri, če je prime 2


puščica modri desni mehurček Z uporabniško določeno funkcijo preverite, ali je številka glavno število

Naslednja Uporabniško določena funkcija pomaga vam tudi pri preverjanju številk, če so osnovne ali ne, storite naslednje:

1. Držite tipko ALT + F11 tipke za odpiranje Microsoft Visual Basic za aplikacije okno.

2. Kliknite Vstavi > Moduliin prilepite naslednjo kodo v Okno modula.

Koda VBA: Preverite, ali je številka osnovna ali ne:

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. Nato shranite in zaprite to kodo, se vrnite na delovni list in vnesite to formulo: = checkprime (A2) v prazno celico poleg seznama številk in nato povlecite ročico za polnjenje navzdol do celic, ki jih želite vsebovati s to formulo; če je število glavno število, bo prikazano TRUE, če ne, bo prikazano FALSE, glejte posnetek zaslona:

doc preveri, če je prime 3

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Comments (21)
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This comment was minimized by the moderator on the site
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.
This comment was minimized by the moderator on the site
Craig, Thanks - that works! Sorry, I didn't read the instructions sufficiently carefully.
This comment was minimized by the moderator on the site
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.
This comment was minimized by the moderator on the site
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).
This comment was minimized by the moderator on the site
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
This comment was minimized by the moderator on the site
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!
This comment was minimized by the moderator on the site
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!
This comment was minimized by the moderator on the site
Yes it worked wen I did Ctrl+Shift+Enter... !! Thank you..:D and Do u mind explaining the algorithm please.
This comment was minimized by the moderator on the site
There's a reference error when you type in numbers that have more than 12 digits.
This comment was minimized by the moderator on the site
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.
This comment was minimized by the moderator on the site
well 4095 is not a prime. still it gives result as prime no though. its incorrect.
This comment was minimized by the moderator on the site
Hello, vaibhav,
When you pasting above formula, you should press Ctrl + Shift + Enter keys together, not just Enter key, please try it again.
This comment was minimized by the moderator on the site
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"))
This comment was minimized by the moderator on the site
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!
This comment was minimized by the moderator on the site
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
This comment was minimized by the moderator on the site
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
This comment was minimized by the moderator on the site
The user defined function does not seem to work for numbers above ~16777213
This comment was minimized by the moderator on the site
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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