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- def IsMultipleOf3(x):
- # Usage: isMult = IsMultipleOf3(123) is not None
- x = reduce(lambda x,y : x+y, [int(y) for y in str(x if x > 0 else -x)])
- if str(x)[:-1]==str(x)[-1:-1]:
- while int(str(x)[-1]) > 1 << len(str(x)): x -= 3
- try: x /= x
- except: return IsMultipleOf3
- else:
- return IsMultipleOf3(x)
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