Prime Number Calculator


Select the type of calculation you want to perform.

Enter the range of numbers, from which you need to identify and list down the prime numbers and press Generate / Check Prime button. NOTE: The difference between the ending number and starting number should not be more than 1000.

The maximum limit is 8,000,000.

Result:

About Prime Number Calculator

This prime number calculator (Generator & Checker) has four options to find prime number.

  1. Finding Prime Numbers Between 2 Numbers

    If you want to find the prime numbers between 2 given numbers, select the option Primes Between 2 Numbers. This is the default option selected in the drop down box. Enter the range of numbers, from which you need to identify and list down the prime numbers. For example; enter 100 in the Starting Number textbox and 200 in the Ending Number textbox. Once the number range is entered, press Generate / Check Prime button. NOTE: The difference between the ending number and starting number should not be more than 1000. i.e. if the starting number is 258603, then the ending number should be less than or equal to 259603.

  2. Check For Prime Number

    If you want to check whether a number is prime or not, select the option Check For Prime Number. After selecting this option, enter the number you want to check for prime in the textbox and press Generate / Check Prime button.

  3. Find The Next prime Number

    If you want to find the next prime number for the given natural number, select the option Find Next Prime Number. After selecting this option, enter a number in the text box and press Generate / Check Prime to find the next prime of the entered number.

  4. Find The Previous prime Number

    If you want to find the previous prime number for the given natural number, select the option Find Previous Prime Number. After selecting this option, enter a number in the text box and press Generate / Check Prime to find the previous prime of the entered number.

Prime Numbers Chart

Generating And Printing The Prime Numbers Chart

  1. Enter the Starting Number you desire to start the chart.
  2. Click the Generate Chart button.
  3. Click the Print button to print the chart you have generated.

Starting Number
 
100003
100019
100043
100049
100057
100069
100103
100109
100129
100151
100153
100169
100183
100189
100193
100207
100213
100237
100267
100271
100279
100291
100297
100313
100333
100343
100357
100361
100363
100379
100391
100393
100403
100411
100417
100447
100459
100469
100483
100493
100501
100511
100517
100519
100523
100537
100547
100549
100559
100591
100609
100613
100621
100649
100669
100673
100693
100699
100703
100733
100741
100747
100769
100787
100799
100801
100811
100823
100829
100847
100853
100907
100913
100927
100931
100937
100943
100957
100981
100987
100999
101009
101021
101027
101051
101063
101081
101089
101107
101111
101113
101117
101119
101141
101149
101159
101161
101173
101183
101197

Prime Numbers

Prime Numbers

Prime numbers are natural numbers which can be divided only by one and itself without a remainder. Here is some of the interesting facts about prime number.

  1. 0 and 1 are not prime numbers.
  2. None of the even numbers are prime numbers except '2' as they are divisible by 2.
  3. Any natural number which ends with 5 is not a prime number except '5' as they are divisible by 5.
  4. The largest prime number identified yet (Jan 2016) is 274,207,281-1. This prime was discovered on 17th Sep 2015.
  5. There is no such efficient formula to identify a prime number. Only sieve theories are available.
  6. To efficiently find primes between smaller numbers you can use Sieve of Eratosthenes theory.
  7. Some of the cryptography technologies like RSA uses large prime numbers.
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