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A171181
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n followed by (n - sum of digits of n).
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4
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0, 0, 1, 0, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 8, 0, 9, 0, 10, 9, 11, 9, 12, 9, 13, 9, 14, 9, 15, 9, 16, 9, 17, 9, 18, 9, 19, 9, 20, 18, 21, 18, 22, 18, 23, 18, 24, 18, 25, 18, 26, 18, 27, 18, 28, 18, 29, 18, 30, 27, 31, 27, 32, 27, 33, 27, 34, 27, 35, 27, 36, 27, 37, 27, 38, 27, 39, 27
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,5
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LINKS
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FORMULA
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EXAMPLE
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a(0) = 0, a(1) = 0 - 0 = 0.
a(2) = 1, a(3) = 1 - 1 = 0.
a(4) = 2, a(5) = 2 - 2 = 0.
a(6) = 3, a(7) = 3 - 3 = 0.
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MATHEMATICA
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Table[{n, n-Total[IntegerDigits[n]]}, {n, 0, 40}]//Flatten (* Harvey P. Dale, Nov 26 2016 *)
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PROG
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(PARI) a(n) = if (n % 2 == 0, n/2, nn = n\2; d = digits(nn); nn - sum(i=1, #d, d[i]); ); \\ Michel Marcus, Aug 14 2013
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CROSSREFS
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KEYWORD
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easy,nonn,base
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AUTHOR
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Marcel Hetkowski Fabeny (marcelfabeny(AT)yahoo.com.br), Dec 04 2009
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EXTENSIONS
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STATUS
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approved
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