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A116273 Numbers k such that k*(k+2) gives the concatenation of two numbers m and m-2. 4
90, 9078, 9900, 733673, 999000, 88225294, 99990000, 8900869207, 9296908811, 9604060396, 9999900000, 326666333266, 673333666733, 700730927007, 972603739726, 999999000000, 34519562953736, 39737862788837 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
90 is a member since 90*92 = 8280 = 82 80.
9078 is a member since 9078*9080 = 82428240 = 8242 8240.
CROSSREFS
Sequence in context: A216706 A166822 A166804 * A036257 A276352 A203779
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, Feb 06 2006
STATUS
approved

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Last modified April 21 19:32 EDT 2024. Contains 371885 sequences. (Running on oeis4.)