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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.)