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 A296117 #21 Dec 07 2017 02:03:28 %S A296117 161038,49699666,760569694,4338249646,357647681422,547551530002, %T A296117 3299605275646,22999986587854,42820164121582,55173914702146, %U A296117 69345154539266,353190859033982 %N A296117 Base-2 pseudoprimes of the form 2*p*q where p and q are primes. %C A296117 a(5) and a(10) are found by McDaniel (1989). %C A296117 Terms in this sequence are of the form 2pq where p and q are distinct odd primes (A075819). - _Charles R Greathouse IV_, Dec 05 2017 %H A296117 W. L. McDaniel, <a href="https://doi.org/10.1090/S0025-5718-1989-0968152-6">Some pseudoprimes and related numbers having special forms</a>, Math. Comp. 53:187 (1989), 407-409. %o A296117 (PARI) list(lim)=my(v=List(),pq); forprime(p=3,lim\6, forprime(q=3,min(lim\(2*p),p), pq=p*q; if(Mod(4,pq)^pq==2, listput(v,2*pq)))); Set(v) \\ _Charles R Greathouse IV_, Dec 05 2017 %Y A296117 Subsequence of A006935 and hence of A015919. %Y A296117 The even terms of A215672. %Y A296117 Intersection of A006935 and A215672. - _Felix Fröhlich_, Dec 05 2017 %Y A296117 Cf. A270973, A075819, A001220. %K A296117 nonn,more %O A296117 1,1 %A A296117 _Max Alekseyev_, Dec 05 2017