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A115527 Numbers k such that the concatenation of k with 2*k gives a square. 29
3, 8163265306122448979592, 18367346938775510204082, 32653061224489795918368, 504986744097967428355005681100871102133568993813912384800 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
3_6 = 6^2.
CROSSREFS
Sequence in context: A058471 A068740 A058473 * A050920 A001231 A089418
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, Jan 25 2006
STATUS
approved

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Last modified March 19 04:26 EDT 2024. Contains 370952 sequences. (Running on oeis4.)