This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A146950 #8 Jul 23 2024 14:47:33
%S A146950 0,120,240,480,680,1040,1320,1800,2160,2760,3200,80,4440,5280,120,
%T A146950 6840,7520,8600,9360,10560,11400,12720,13640,15080,16080,360,18720,
%U A146950 20400,440,23360,24600,26520,27840,29880,31280,33440,34920,37200,38760,120
%N A146950 Terms of A061047 ending in 0.
%F A146950 a(n) = 40*A146952(n). - _Andrew Howroyd_, Jan 03 2020
%t A146950 Select[Table[Numerator[1/49-1/n^2],{n,7,250}],Mod[#,10]==0&] (* _Harvey P. Dale_, Jul 23 2024 *)
%o A146950 (PARI) seq(n)={my(L=List(), k=5); while(#L<n, k++; my(t=numerator(1/49 - 1/k^2)); if(t%10==0, listput(L,t))); Vec(L)} \\ _Andrew Howroyd_, Jan 03 2020
%Y A146950 Cf. A061047, A146952.
%K A146950 nonn,base,less
%O A146950 1,2
%A A146950 _Paul Curtz_, Nov 03 2008
%E A146950 Offset corrected and terms a(11) and beyond from _Andrew Howroyd_, Jan 03 2020