restart.'s blog

generate next prime number for a given n
By restart., 10 years ago, In English

how to generate next prime number for a given long interger n where n can be 0<=n<=10^18

for example if n is 10 then the next prime number is 11. how can i do it in 0.5 sec?? is there any number theory? pls give me any suggestion..

thanks in advance..

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10 years ago, # |
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http://en.wikipedia.org/wiki/Prime_gap, so simple bruteforce is fast( of course, you need a reasonable primality test).

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10 years ago, # |
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http://www.wikihow.com/Check-if-a-Number-Is-Prime

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