from euler.prime import PrimenessChecker
pc = PrimenessChecker("primes.txt", maxprime=1000000)
circularcount = 0
for i in range(len(pc.primes)):
p = pc.primes[i]
if p < 10:
circularcount += 1
continue
allprime = 0
pstr = str(p)
for s in range(len(pstr)):
pstr = pstr[1:] + pstr[0]
anint = int(pstr)
if not pc.is_prime(anint):
break
else:
allprime = 1
if i % 10000 == 0:
print i
if allprime == 1:
circularcount += 1
print circularcount
from euler.prime import PrimenessChecker
pc = PrimenessChecker('primes.txt', maxprime = 2000000)
result = [-1000, -1000, 0]
def quadratic(a, b, n):
return n**2 + a*n + b
for a in range(-999, 1000):
for b in range(-999, 1000):
n = 0
count = 0
while pc.is_prime(quadratic(a, b, n)):
count += 1
n += 1
if count > result[2]:
result = [a, b, count]
if a % 100 == 0:
print a # progress report
print result
print result[0] * result[1]