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 A177798 #16 Jun 02 2025 02:56:17 %S A177798 2,7,167,199,6271,12227,168713,579907,5937157,6829751,8059943, %T A177798 66858173,167857663,661416709,2322857987,12012698381,14641587607, %U A177798 26304771553,49671709081,1244930533403,1922085626009 %N A177798 First primes of record chains of consecutive primes such that all of them are odious (A027697). %C A177798 The corresponding record lengths are: 1,3,6,9,11,15, etc. (A177800). %o A177798 (PARI) back(p,k)=while(k--,p=precprime(p-1));precprime(p-1) %o A177798 r=s=0;forprime(p=2,1e9,if(hammingweight(p)%2,s++,if(s>r,r=s;print1(back(p,r)", "));s=0)) \\ _Charles R Greathouse IV_, Mar 29 2013 %Y A177798 Cf. A177748 (evil version), A000069, A001969, A027697, A027699, A177800. %K A177798 nonn,base,more %O A177798 1,1 %A A177798 _Vladimir Shevelev_, Dec 12 2010 %E A177798 More terms from _D. S. McNeil_, Dec 12 2010 %E A177798 a(20)-a(21) from _Amiram Eldar_, Dec 09 2020