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 A156898 #11 Oct 30 2017 22:39:23
%S A156898 1,2,3,5,5,7,10,10,11,13,17,17,19,23,26,29,29,31,33,37,41,43,47,51,53,
%T A156898 59,61,65,67,71,73,79,82,83,89,97,101,103,107,109,113,122,127,127,129,
%U A156898 131,137,139,149,151,157,163,167,170,173,179,181,191,193,197,199,211
%N A156898 a(n) = the smallest squarefree integer >= the n-th prime power.
%C A156898 The first prime power is considered to be 1 here.
%H A156898 Michael De Vlieger, <a href="/A156898/b156898.txt">Table of n, a(n) for n = 1..10000</a>
%t A156898 Block[{nn = 216, s}, s = {1}~Join~Select[Range[nn], PrimePowerQ]; Map[SelectFirst[# + Range[0, #], SquareFreeQ] &, s]] (* _Michael De Vlieger_, Oct 30 2017 *)
%Y A156898 Cf. A081217, A156899, A156900, A005117, A000961.
%K A156898 nonn
%O A156898 1,2
%A A156898 _Leroy Quet_, Feb 17 2009, Feb 18 2009
%E A156898 Extended by _Ray Chandler_, Jun 19 2009