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For challenges about identifying and manipulating prime numbers

2 votes

Find the smallest prime from a substring

Sage, 72 Runs in the interactive prompt a=raw_input() i=0 p=2 while a not in str(p):i+=1;p=Primes().unrank(i) p Primes().unrank(i) gives the ith prime number, with the 0th prime being 2. …
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15 votes

Determine if a number is prime without using arithmetic

input()in Primes() 3 gives True, 4 gives False …
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  • 9,018