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 A165993 #11 Aug 10 2014 14:05:28
%S A165993 0,1,4,11,31,44,80,103,157,252,293,420,520,575,695,884,1105,1180,1431,
%T A165993 1617,1704,2007,2217,2552,3040,3300,3439,3713,3852,4144,5255,5595,
%U A165993 6120,6305,7252,7457,8060,8695,9141,9804,10507,10740,11983,12224,12740
%N A165993 a(n) = sum_{j=1..prime(n)-1} floor (j^2/prime(n)).
%H A165993 C. H. Gribble, <a href="/A165993/b165993.txt">Table of n, a(n) for n=1..78498 (i.e. for primes < 10^6)</a>.
%F A165993 a(n) = A166375(prime(n)-1). - _Charles R Greathouse IV_, Jun 28 2013
%t A165993 Table[Sum[Floor[j^2/n],{j,n-1}],{n,Prime[Range[50]]}] (* _Harvey P. Dale_, Aug 10 2014 *)
%o A165993 (PARI) a(n) = sum(j=1, prime(n)-1, floor (j^2/prime(n))) \\ _Michel Marcus_, Jun 20 2013
%o A165993 (PARI) a(n)=my(p=prime(n));sum(j=1,p-1,j^2\p) \\ _Charles R Greathouse IV_, Jun 20 2013
%Y A165993 Cf. A166375, A165974, A014817.
%K A165993 nonn
%O A165993 1,3
%A A165993 _Christopher Hunt Gribble_, Oct 03 2009
%E A165993 Definition rephrased by R. J. Mathar, Oct 09 2009