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A019566
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Unique numbers: 1-1, 21-12, 321-123, ..., 10987654321-12345678910, 1110987654321-1234567891011, etc.
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2
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0, 9, 198, 3087, 41976, 530865, 6419754, 75308643, 864197532, -1358024589, -123580236690, -2345801446791, 775432077543108, 178553219976533007, 27956332009875522906, 3805734210999774512805, 481583522109989673502704, 58259362312008979572492603
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| S. S. Gupta, Unique Numbers, Science Today, Jan 01 1988, India.
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LINKS
| Shyam Sunder Gupta, Unique Numbers
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MATHEMATICA
| f[n_] := Block[ {a = "", k = 1}, While[k < n + 1, a = StringJoin[ ToString[k], a]; k++ ]; Return[ ToExpression[a] - ToExpression[ StringReverse[a]]]]; Table[ f[n], {n, 1, 17} ]
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PROG
| (PARI) A = vector(25); c = 1; f = 1; for (i = 2, 9, c = 10*c + i; f = f + i*10^(i - 1); A[i] = (f - c)); for (i = 10, 25, c = 100*c + i; f = f + i*10^(2*i - 11);; A[i] = (f - c)); A (Wasserman)
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CROSSREFS
| A019566(n) = A000422(n)-A007908(n).
Sequence in context: A017426 A180778 A110807 * A157563 A003026 A157594
Adjacent sequences: A019563 A019564 A019565 * A019567 A019568 A019569
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KEYWORD
| sign,base
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AUTHOR
| Robert M. Dickau (robertd(AT)wolfram.com)
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EXTENSIONS
| More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 11 2002
More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Nov 09 2004
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