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 A110931 #41 Jul 28 2022 20:57:02 %S A110931 2,3,357,1400,205731,296598 %N A110931 Numbers k such that 2*k^k - 1 is prime. %C A110931 a(5) > 4000. - _Ray G. Opao_, Oct 23 2014 %C A110931 a(5) > 101000. - _Serge Batalov_, Apr 13 2018 %e A110931 3 is in the sequence since 2*3^3 - 1 = 53 is prime. %t A110931 Select[Range[1000], PrimeQ[2*#^# - 1] &] (* _Vaclav Kotesovec_, Oct 31 2014 *) %o A110931 (PARI) for(n=1,2000,1;if(isprime(2*n^n-1),print(n))) \\ _Ray G. Opao_, Oct 23 2014 %o A110931 (Magma) [n: n in [0..500] | IsPrime(2*n^n-1)]; // _Vincenzo Librandi_, Nov 01 2014 %Y A110931 Numbers k such that b*k^k - b + 1 is prime: this sequence (b=2), A301521 (b=4), A302123 (b=6). %Y A110931 Cf. A110932, A062207, A108318. %K A110931 more,nonn,hard %O A110931 1,1 %A A110931 _Ray G. Opao_, Sep 25 2005 %E A110931 a(5-6) from _Ryan Propper_, Jul 24-28 2022