Created
July 30, 2012 21:35
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| class Pentagonals(object): | |
| def __init__(self): | |
| self._nums={} | |
| def add_pent(self): | |
| n=len(self._nums)+1 | |
| self._nums[n-1]=(n*((3*n)-1)/2) | |
| def is_pent(self, n): | |
| return n in self._nums | |
| def __getitem__(self, n): #special function accessible via [] | |
| while n>=len(self._nums): | |
| self.add_pent() | |
| return self._nums[n-1] | |
| a = 2 | |
| finished=False | |
| pents=Pentagonals() | |
| while not finished: | |
| for b in range(1, a): | |
| a_pent, b_pent = pents[a], pents[b] | |
| if pents.is_pent(a_pent-b_pent) and pents.is_pent(a_pent+b_pent): | |
| print a_pent-b_pent | |
| finished=True | |
| a+=1 | |
| print str(a) + "\r", |
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