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 A212458 #22 Jan 20 2024 11:27:47
%S A212458 8,23,40,59,80,102,124,147,171,195,220,245,271,297,323,350,377,404,
%T A212458 432,460,488,517,545,574,603,632,662,691,721,751,781,812,842,873,903,
%U A212458 934,965,996,1028,1059,1091,1122,1154,1186
%N A212458 a(n) = floor(5n*log(5n)).
%H A212458 Vincenzo Librandi, <a href="/A212458/b212458.txt">Table of n, a(n) for n = 1..1000</a>
%t A212458 Table[Floor[5*n*Log[5*n]], {n, 80}] (* _Vincenzo Librandi_, Feb 13 2013 *)
%o A212458 (Derive) PROG(y := [], x := 100, LOOP(IF(x = 0, RETURN y), y := ADJOIN(FLOOR(5·x·LOG(5·x)), y), x := x - 1))
%o A212458 (Magma) [Floor(5*n*Log(5*n)): n in [1..80]]; // _Vincenzo Librandi_, Feb 13 2013
%o A212458 (PARI) a(n)=5*n*log(5*n)\1 \\ _Charles R Greathouse IV_, Sep 04 2015
%Y A212458 Cf. A050502, A050504, A212455, A212456, A212457, A212459, A212460, A212461, A212462.
%K A212458 easy,nonn
%O A212458 1,1
%A A212458 _Mohammad K. Azarian_, May 31 2012