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A115529 Numbers n such that the concatenation of 2*n with n gives a square. 0
1632653061224489796, 3673469387755102041, 6530612244897959184, 108166576527852893455922120064900, 130881557598702001081665765278529, 155759870200108166576527852893456, 182801514332071389940508382909681 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

3265306122448979592_1632653061224489796 = 5714285714285714286^2.

CROSSREFS

Cf. A102567, A106497, A115527 - A115556.

Sequence in context: A281507 A160045 A113741 * A229864 A113740 A281508

Adjacent sequences:  A115526 A115527 A115528 * A115530 A115531 A115532

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, Jan 25 2006

STATUS

approved

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Last modified November 20 03:34 EST 2018. Contains 317371 sequences. (Running on oeis4.)