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058.py
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058.py
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'''
Starting with 1 and spiralling anticlockwise in the following way, a square spiral with side length 7 is formed.
37 36 35 34 33 32 31
38 17 16 15 14 13 30
39 18 5 4 3 12 29
40 19 6 1 2 11 28
41 20 7 8 9 10 27
42 21 22 23 24 25 26
43 44 45 46 47 48 49
It is interesting to note that the odd squares lie along the bottom right diagonal, but what is more interesting is that 8 out of the 13 numbers lying along both diagonals are prime; that is, a ratio of 8/13 ~ 62%.
If one complete new layer is wrapped around the spiral above, a square spiral with side length 9 will be formed. If this process is continued, what is the side length of the square spiral for which the ratio of primes along both diagonals first falls below 10%?
'''
import prime
prime._refresh(50000)
width, diagonal, base, primes = 1, 1, 1, 0
while True:
width = width + 2
increment = width - 1
for i in xrange(0, 4):
diagonal = diagonal + increment
if i < 3 and prime._isprime(diagonal): primes += 1
base = base + 4
if primes * 10 < base:
print width
break