46 lines
595 B
Text
46 lines
595 B
Text
fastfunc isprim num .
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if num < 2
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return 0
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.
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i = 2
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while i <= sqrt num
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if num mod i = 0
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return 0
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.
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i += 1
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.
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return 1
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.
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func isright h .
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while h > 0
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if isprim h = 0
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return 0
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.
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h = h div 10
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.
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return 1
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.
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func isleft h .
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d = pow 10 (floor log10 h)
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while h > 0
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if isprim h = 0
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return 0
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.
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if h div d = 0
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return 0
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.
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h = h mod d
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d /= 10
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.
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return 1
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.
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p = 999999
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while isleft p = 0
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p -= 2
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.
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print p
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p = 999999
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while isright p = 0
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p -= 2
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.
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print p
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