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A115527 Numbers n such that the concatenation of n with 2*n gives a square. 29
3, 8163265306122448979592, 18367346938775510204082, 32653061224489795918368, 504986744097967428355005681100871102133568993813912384800 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..5.

EXAMPLE

3_6 = 6^2.

CROSSREFS

Cf. A102567, A106497, A115528 - A115556.

Sequence in context: A058471 A068740 A058473 * A050920 A001231 A089418

Adjacent sequences:  A115524 A115525 A115526 * A115528 A115529 A115530

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, Jan 25 2006

STATUS

approved

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Last modified November 20 02:57 EST 2018. Contains 317371 sequences. (Running on oeis4.)