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products = set() | |
for pair in [(a, b) for a in range(2, 101) for b in range(2, 101)]: | |
products.add(pair[0] ** pair[1]) | |
print len(products) |
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from itertools import * | |
pairs = product(range(1, 100), range(1, 100)) | |
exponentials = imap(lambda pair: pair[0] ** pair[1], pairs) | |
strings = imap(lambda exponential: str(exponential), exponentials) | |
sums = imap(lambda string: sum(map(lambda digit: int(digit), string)), strings) | |
print max(sums) |
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current = 0 | |
step = 2 | |
sum = 0 | |
limit = 1001 ** 2 | |
spiral = range(1, limit + 1) | |
while current < limit: | |
for i in range(4): | |
if current > limit: |
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import operator | |
def factorial(n): | |
return 1 if n == 0 else reduce(operator.mul, range(1, n + 1)) | |
def combo(n, r): | |
return factorial(n) / (factorial(r) * factorial(n - r)) | |
count = 0 |
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digits = "" | |
for n in range(1, 1000001): | |
digits += str(n) | |
product = 1 | |
for i in range(7): | |
product *= int(digits[10 ** i - 1]) | |
print product |
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(defn prime-factorization-aux [n candidate] | |
(if (= n 1) | |
'() | |
(if (= (mod n candidate) 0) | |
(cons candidate (prime-factorization-aux (/ n candidate) candidate)) | |
(prime-factorization-aux n (+ candidate 1))))) | |
(defn prime-factorization [n] | |
(prime-factorization-aux n 2)) |
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def prime_factorization(n): | |
candidate = 2 | |
while n > 1: | |
factors = [] | |
while n % candidate == 0: | |
factors.append(candidate) | |
n /= candidate | |
if factors: | |
yield factors | |
candidate += 1 |
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def triangle_numbers(): | |
n = 1 | |
while True: | |
yield n * (n + 1) / 2 | |
n += 1 | |
def prime_factorization(n): | |
candidate = 2 | |
while n > 1: | |
factors = [] |
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def is_even(n): | |
return n % 2 == 0 | |
def collatz_length(n): | |
length = 0 | |
while n > 1: | |
length += 1 | |
if is_even(n): | |
n /= 2 | |
else: |
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from itertools import permutations | |
MILLIONTH = 10 ** 6 - 1 | |
print reduce(lambda x, y: str(x) + str(y), list(permutations(range(10), 10))[MILLIONTH]) |