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 A153601 #11 May 12 2021 03:04:54 %S A153601 1,3,5,7,11,13,17,31,43,57,73,127,151,205,241,257,331,683,2047,2359, %T A153601 2731,3277,4033,5419,8191,43691,61681,65281,65537,80581,131071,174763, %U A153601 261633,262657,524287,599479,838861,1016801,1082401,1397419,2796203 %N A153601 Numbers representable as Phi(k,2), the k-th cyclotomic polynomial evaluated at 2, for some k>0. %C A153601 Odd numbers in A019320. %C A153601 For primes in this sequence see: A153602. %Y A153601 Cf. A019320, A153443, A153602. %K A153601 nonn %O A153601 1,2 %A A153601 _Artur Jasinski_, Dec 29 2008 %E A153601 Edited by _T. D. Noe_, Apr 27 2009