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A071650
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Difference between sums of odd and even digits of n.
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13
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1, -2, 3, -4, 5, -6, 7, -8, 9, 1, 2, -1, 4, -3, 6, -5, 8, -7, 10, -2, -1, -4, 1, -6, 3, -8, 5, -10, 7, 3, 4, 1, 6, -1, 8, -3, 10, -5, 12, -4, -3, -6, -1, -8, 1, -10, 3, -12, 5, 5, 6, 3, 8, 1, 10, -1, 12, -3, 14, -6, -5, -8, -3, -10, -1, -12, 1, -14, 3, 7, 8, 5, 10
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OFFSET
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1,2
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LINKS
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FORMULA
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MATHEMATICA
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Table[Total[Select[IntegerDigits[n], OddQ]]-Total[Select[ IntegerDigits[ n], EvenQ]], {n, 80}] (* Harvey P. Dale, Jul 27 2020 *)
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PROG
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(PARI) a(n) = {my(d=digits(n), s = 0); for (k=1, #d, if (d[k] % 2, s += d[k], s -= d[k]); ); s; } \\ Michel Marcus, Aug 05 2017
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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