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A116238
Numbers k such that k*(k+7) gives the concatenation of two numbers m and m-8.
5
69, 79822842, 69852478553064869297984899963804, 77473062193002372448027740546436, 77747359197583788609974143907616, 84341826458653210947638195982112, 85367942837521291760016984490248
OFFSET
1,1
EXAMPLE
79822842 * 79822849 = 63716866//63716858, where // denotes concatenation.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, Feb 06 2006
STATUS
approved