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 A256638 #26 Apr 21 2018 17:41:44 %S A256638 273,357,429,546,561,609,627,714,759,777,819,858,897,957,969,987,1001, %T A256638 1023,1071,1092,1122,1131,1218,1221,1239,1254,1287,1309,1407,1419, %U A256638 1428,1463,1491,1518,1547,1551,1554,1638,1659,1677,1683,1716,1729,1749,1767,1771,1794,1827,1869,1881,1887,1911,1914,1938 %N A256638 Orders n of cyclotomic polynomials containing a coefficient with an absolute value greater than one, with n not divisible by 5. %C A256638 Numbers in A013590 that are not divisible by 5. %o A256638 (PARI) is(n)=if(n%5, for(k=0, n, if(abs(polcoeff(polcyclo(n), k))>1, return(n))); 0) %o A256638 for(n=1, 10^4, if(is(n), print1(n, ", "))) \\ edited by _Michel Marcus_, Apr 21 2018 %Y A256638 Cf. A013590, A013595. %K A256638 nonn %O A256638 1,1 %A A256638 _Derek Orr_, Apr 22 2015