49 lines
911 B
Python
49 lines
911 B
Python
def alanum(x):
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lis = []
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while x != 0:
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lis.append(x % 10)
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x /= 10
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return lis
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def pick(x, lis, out, a = 0):
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if x == 0:
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out.append([a, lis])
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return
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a *= 10
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for i in xrange(len(lis)):
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tmp = lis[:]
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tmpa = a + lis[i]
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tmp.pop(i)
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pick(x - 1, tmp, out, tmpa)
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def isp(x):
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if x == 2:
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return True
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if x <= 1 or x & 1 == 0:
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return False
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for i in xrange(3, int(x ** 0.5) + 1, 2):
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if x % i == 0:
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return False
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return True
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def main():
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n = 1489
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while 1:
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if isp(n):
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tmp = alanum(n)
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ttmp = []
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pick(4, tmp, ttmp)
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tt = []
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for ti in ttmp:
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tt.append(ti[0])
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#print n, tmp, tt
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while tt.count(n) > 0:
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tt.remove(n)
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for ii in tt:
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jj = 2 * ii - n
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if jj > 0 and isp(ii) and isp(jj) and tt.count(jj):
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return str(n) + str(ii) + str(jj) #(n, ii, jj)
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n += 1
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print main()
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