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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 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
79822845 * 79822846 = 63716866//63716870, where // denotes concatenation.
CROSSREFS
Sequence in context: A182465 A308703 A277987 * A341175 A044166 A044547
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, Feb 06 2006
STATUS
approved

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Last modified June 17 05:47 EDT 2024. Contains 373432 sequences. (Running on oeis4.)