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A023113 Numbers n such that n remains square when digit 6 is appended. 0

%I

%S 1,25,1849,36481,2666689,52606009,3845364121,75857828929,

%T 5545012396225,109386936710041,7995904029992761,157735886878050625,

%U 11530088066237165569,227455039491212291641,16626378995609962758169

%N Numbers n such that n remains square when digit 6 is appended.

%C The terms of the sequence are the squares of the y-values in the solution to the Pellian equation x^2-10*y^2=6. - _Colin Barker_, Sep 28 2013

%F Empirical G.f.: -x*(x^4+24*x^3+382*x^2+24*x+1) / ((x-1)*(x^2-38*x+1)*(x^2+38*x+1)). [_Colin Barker_, Jan 31 2013]

%K nonn,base

%O 1,2

%A _David W. Wilson_

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Last modified February 21 15:29 EST 2019. Contains 320374 sequences. (Running on oeis4.)