

A116314


Numbers k such that k*(k+1) gives the concatenation of two numbers m and m+4.


4



28, 72, 79822845, 69852478553064869297984899963807, 77473062193002372448027740546439, 77747359197583788609974143907619, 84341826458653210947638195982115, 85367942837521291760016984490251
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OFFSET

1,1


LINKS



EXAMPLE

79822845 * 79822846 = 63716866//63716870, where // denotes concatenation.


CROSSREFS



KEYWORD

nonn,base


AUTHOR



STATUS

approved



