def main2(N):
print "Generating primes"
maxp = int(sqrt(N)) + 1
primes = FastPrimeSieve(maxp)
print "Computing factors"
prev = 0
total = 0
for n in xrange(2,int(1e7) +1):
prime_factors = trial_division(n, primes)
ndivs = ndivisors(n, prime_factors)
if ndivs == prev:
total += 1
prev = ndivs
if n % 100000 == 0:
print n
print total
def worker_file(a, b, primes):
with gzip.open("dump.bin", "ab", compresslevel=3) as fp:
buf = []
for n in xrange(a, b):
prime_factors = trial_division(n, primes)
num_factors = len(prime_factors)
data = {
"n": n,
"factors": prime_factors,
"ndivisors": ndivisors(n, prime_factors),
"nfactors": num_factors,
"max_factor": max(prime_factors),
"primality": num_factors == 1,
}
buf.append(data)
cPickle.dump(buf, fp, protocol=2)
return b - a
def worker_db(a,b, primes):
with Connection('localhost') as con:
db = con['integers']
col = db['misc']
buf = []
for n in xrange(a, b):
prime_factors = trial_division(n, primes)
num_factors = len(prime_factors)
data = {'n' : n,
'factors' : prime_factors,
'ndivisors' : ndivisors(n, prime_factors),
'nfactors' : num_factors,
'max_factor': max(prime_factors),
'primality' : num_factors == 1}
buf.append(data)
col.insert(buf)
con.disconnect()
return (b-a)