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 A110397 a(n) = (10^k - n)(10^k + n), where k is the number of digits in n. 1
 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; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Harvey P. Dale, Table of n, a(n) for n = 1..1000 EXAMPLE a(3)=(10-3)(10+3)=91; a(11)=(100+11)(100-11)=111*89=9879. MAPLE 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 # Emeric Deutsch, Aug 01 2005 MATHEMATICA Table[Times@@(10^IntegerLength[n]+{n, -n}), {n, 50}] (* Harvey P. Dale, May 31 2015 *) CROSSREFS Sequence in context: A305046 A316732 A033419 * A298509 A185504 A304009 Adjacent sequences:  A110394 A110395 A110396 * A110398 A110399 A110400 KEYWORD base,easy,nonn AUTHOR Amarnath Murthy, Jul 29 2005 EXTENSIONS More terms from Emeric Deutsch, Aug 01 2005 STATUS approved

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Last modified January 22 23:50 EST 2022. Contains 350504 sequences. (Running on oeis4.)