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 A354537 #22 Jan 21 2025 13:32:41
%S A354537 1,511,147573952589676412927,
%T A354537 174224571863520493293247799005065324265471
%N A354537 Numbers k that are not Mersenne primes (A000668) such that 2*k is in A354525.
%C A354537 Terms in A354536 that are not Mersenne primes. Note that all Mersenne primes are in A354536.
%C A354537 a(5) = 2^727 - 1 is too large to include here. - _Jinyuan Wang_, Jan 21 2025
%F A354537 By definition, equals A354536 \ A000668.
%F A354537 a(n) = 2^A354532(n) - 1 = A354534(n)/2.
%e A354537 See A354532.
%o A354537 (PARI) lista(nn,{lim=256},{lim_p=1<<32}) = for(n=1, nn, if(isA354532(n,lim,lim_p), print1(2^n-1, ", "))) \\ See A354532 for the function isA354532
%Y A354537 Cf. A000668, A354525, A354532, A354534, A354536.
%K A354537 nonn,hard
%O A354537 1,2
%A A354537 _Jianing Song_, Aug 17 2022