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%I #11 Mar 08 2014 04:30:59
%S 3,19,166,894,5703,12654,620046,4235622,24518766,133763479,575536407,
%T 7275224659,63521178243,36407018199,1783943891751,12048048160062,
%U 62797942092807,615169213046419,4293026969512678,29406470217788179,174254081653289398,2627356192258967382
%N Differences between odd powers of 7 and the next smaller square.
%H Hugo Pfoertner, <a href="/A201123/b201123.txt">Table of n, a(n) for n = 1..500</a>
%F a(n) = 7^(2*n-1) - floor(sqrt(7^(2*n-1)))^2.
%e a(1)=7^1-2^2=3, a(2)=7^3-18^2=343-324=19, a(3)=7^5-129^2=16807-16641=166.
%t Table[7^(2 n - 1) - Floor[Sqrt[7^(2 n - 1)]]^2, {n, 30}] (* _Wesley Ivan Hurt_, Mar 06 2014 *)
%Y Cf. A051218.
%K nonn
%O 1,1
%A _Hugo Pfoertner_, Nov 27 2011
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