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Search: id:A110397
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| A110397 |
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a(n) = (10^k - n)(10^k + n), where k is the number of digits in n. |
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+0
1
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| 99, 96, 91, 84, 75, 64, 51, 36, 19, 9900, 9879, 9856, 9831, 9804, 9775, 9744, 9711, 9676, 9639, 9600, 9559, 9516, 9471, 9424, 9375, 9324, 9271, 9216, 9159, 9100, 9039, 8976, 8911, 8844, 8775, 8704, 8631, 8556, 8479, 8400, 8319, 8236, 8151, 8064, 7975
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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a(3)=(10-3)(10+3)=91; a(11)=(100+11)(100-11)=111*89=9879.
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MAPLE
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s:=proc(m) nops(convert(m, base, 10)) end: a:=n->(10^(s(n))-n)*(10^(s(n))+n): seq(a(n), n=1..55); # s gives number of digits (Deutsch)
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CROSSREFS
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Sequence in context: A113602 A097846 A033419 this_sequence A072433 A133650 A045298
Adjacent sequences: A110394 A110395 A110396 this_sequence A110398 A110399 A110400
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KEYWORD
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base,easy,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jul 29 2005
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EXTENSIONS
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More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Aug 01 2005
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