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A116307 Numbers k such that k*(k+1) gives the concatenation of two numbers m and m+3. 4
83, 77394229, 89158935, 36623663376237623663376337, 37633762366336633762366237, 62366237633663366237633763, 63376336623762376336623663, 86194223018927804587702130 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
89158935 * 89158936 = 79493157//79493160, where // denotes concatenation.
CROSSREFS
Sequence in context: A116263 A287686 A087532 * A093676 A221416 A130432
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, Feb 06 2006
STATUS
approved

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Last modified May 21 16:41 EDT 2024. Contains 372738 sequences. (Running on oeis4.)