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 A323354 #7 Jan 12 2019 10:29:06 %S A323354 5,15,25,35,45,51,55,65,75,85,95,105,115,125,135,145,153,155,165,175, %T A323354 185,195,205,215,225,235,245,255,265,275,285,295,305,315,325,335,345, %U A323354 355,357,365,375,385,395,405,415,425,435,445,455,459,465,475,485 %N A323354 Odd n such that A015525(n) is not squarefree. %H A323354 Hugo Pfoertner, <a href="/A323354/b323354.txt">Table of n, a(n) for n = 1..5487</a> %e A323354 a(1) = 5: A015525(5) = 361 = 19^2. All multiples of 5 are in the sequence and have 19^2 as a factor. %e A323354 a(6) = 51: A015525(51) = 3005793749329960987137864733842257 = 17^2 * 67 * 307 * 624669523 * 809464558443747299. %o A323354 (PARI) anm2=1;anm1=3;for(n=3,155,an=3*anm1+8*anm2;anm2=anm1;anm1=an;if(n%2&&!issquarefree(an),print1(n,", "))) %Y A323354 Cf. A015525, A323353. %K A323354 nonn %O A323354 1,1 %A A323354 _Hugo Pfoertner_, Jan 12 2019