def fibSequence(start, maximum):
i = start
cur = euler.fib(i)
while cur < maximum:
yield cur
i += 1
cur = euler.fib(i)
def main():
"""
>>> main()
4782
"""
fibs = izip(fib(), count(1))
print(next(dropwhile(lambda f: int(log10(f[0])) + 1 < 1000, fibs))[1])
def get_fib_nums(end):
''' Return a list of all Fibonacci numbers up to 'end' '''
nums = []
for n in fib():
if n > end:
break
nums += [n]
return nums
def main():
''' Driver function '''
index = 1
for f in fib():
if len(str(f)) == 1000:
break
index += 1
print(index)
def euler2():
result = 0
i = 0
current = 0
while current < 4e6:
i += 1
current = fib(i)
if current % 2 == 0: result += current
print(result)
def main():
''' Driver function '''
total = 0
end = 4 * 10**6
for f in fib():
if not f % 2:
total += f
if f > end:
break
print(total)
def sumEvenFibsLessThan(num):
fibs = []
i = 1
while True:
f = euler.fib(i)
i += 1
if f < num:
fibs.append(f)
else:
break
return sum([n for n in fibs if n % 2 == 0])
def main():
"""
>>> main()
4613732
"""
limit = 4000000
print(
sum(
(x for x in takewhile(lambda x: x < limit, fib()) if x % 2 == 0)
)
)
def main():
"""
>>> main()
2252639041804718029
"""
limit = 10 ** 17
fibs = list(takewhile(lambda x: x < limit, fib()))
zrts = {1: 0}
def sum_z(number):
"""
sum_z computes the sum of the zeckendorf representations terms up
to the given number.
"""
if number not in zrts:
f = max((f for f in fibs if f < number))
zrts[number] = number - f + sum_z(number - f) + sum_z(f)
return zrts[number]
print(sum_z(limit))
def euler25():
print(next(i for i in count() if len(str(fib(i))) >= 1000))
from itertools import count, izip from euler import fib, findfirst # The Fibonacci sequence is defined by the recurrence relation: # # Fn = Fn-1 + Fn-2, where F1 = 1 and F2 = 1. # # Hence the first 12 terms will be: # # F1 = 1 # F2 = 1 # F3 = 2 # F4 = 3 # F5 = 5 # F6 = 8 # F7 = 13 # F8 = 21 # F9 = 34 # F10 = 55 # F11 = 89 # F12 = 144 # # The 12th term, F12, is the first term to contain three digits. # # What is the first term in the Fibonacci sequence to contain 1000 digits? # we need to increase with two because fib() starts with 1 and 2, not 1 and 1 LEN = 1000 print findfirst(izip(count(), fib()), lambda x: len(str(x[1])) >= LEN)[0] + 1
def fib_generator():
i = 1
while True:
yield fib(i)
i += 1
import euler consider = [euler.fib(n) for n in range(70) if euler.fib(n) < 4000000 and euler.fib(n)%2 ==0] print sum(consider)
import euler
consider = [
euler.fib(n) for n in range(70)
if euler.fib(n) < 4000000 and euler.fib(n) % 2 == 0
]
print sum(consider)
import sys
sys.path.append("../projecteuler")
from euler import fib
f = str(fib(int(sys.argv[1])))
ans = ""
for i in range(0, len(f), 20000):
ans += f[i]
print(ans)
import euler
n = 1
while len(str(euler.fib(n))) < 1000:
n += 1
print n + 1
#!/usr/bin/env python
# Copyright (c) 2008 by Steingrim Dovland <*****@*****.**>
from euler import fib
# Each new term in the Fibonacci sequence is generated by adding the
# previous two terms. By starting with 1 and 2, the first 10 terms will
# be:
#
# 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, ...
#
# Find the sum of all the even-valued terms in the sequence which do not
# exceed four million.
terms = [ x for x in fib(4*1000*1000) if x % 2 == 0 ]
print sum(terms)
def fib_gen2():
i = 0
while fib(i) < 4 * 10**6:
if fib(i) % 2 == 0:
yield fib(i)
i += 1
#!/usr/bin/python
# coding: UTF-8
"""
@author: CaiKnife
Even Fibonacci numbers
Problem 2
Each new term in the Fibonacci sequence is generated by adding the previous two terms. By starting with 1 and 2, the first 10 terms will be:
1, 2, 3, 5, 8, 13, 21, 34, 55, 89, ...
By considering the terms in the Fibonacci sequence whose values do not exceed four million, find the sum of the even-valued terms.
"""
from euler import fib
MAX = 4000000
i = 1
results = []
while fib(i) < MAX:
if not fib(i) % 2:
results.append(fib(i))
i += 1
print sum(results)
#!/opt/local/bin/python from euler import fib from itertools import dropwhile print dropwhile(lambda (a, b): len(str(b)) < 1000, enumerate(fib())).next()[0]
