A153601 - OEIS

%I #11 May 12 2021 03:04:54

%S 1,3,5,7,11,13,17,31,43,57,73,127,151,205,241,257,331,683,2047,2359,

%T 2731,3277,4033,5419,8191,43691,61681,65281,65537,80581,131071,174763,

%U 261633,262657,524287,599479,838861,1016801,1082401,1397419,2796203

%N Numbers representable as Phi(k,2), the k-th cyclotomic polynomial evaluated at 2, for some k>0.

%C Odd numbers in A019320.

%C For primes in this sequence see: A153602.

%Y Cf. A019320, A153443, A153602.

%K nonn

%O 1,2

%A _Artur Jasinski_, Dec 29 2008

%E Edited by _T. D. Noe_, Apr 27 2009