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a(n) = sqrt(84*A144930(n)^2 - 3).
2

%I #6 Mar 07 2022 14:22:21

%S 9,999,109881,12085911,1329340329,146215350279,16082359190361,

%T 1768913295589431,194564380155647049,21400312903825585959,

%U 2353839855040658808441,258900983741568643342551,28476754371717510108872169,3132184079905184543332596039,344511772035198582256476692121

%N a(n) = sqrt(84*A144930(n)^2 - 3).

%D E.-A. Majol, Note #2228, L'Intermédiaire des Mathématiciens, 9 (1902), pp. 183-185.

%H <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (110,-1).

%F G.f.: 9*x*(1+x)/(1-110*x+x^2) . - _R. J. Mathar_, Mar 07 2022

%F a(n) = 9*A298677(n-1). - _R. J. Mathar_, Mar 07 2022

%Y Cf. A144930.

%K nonn

%O 1,1

%A _N. J. A. Sloane_, Mar 03 2022