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 A270104 #21 Jul 07 2024 01:14:07 %S A270104 1,2,7,8,13,43,55,59,145,149,545,2468,4049,4055,15653,22765,99932 %N A270104 Numbers k such that 3^k + k*2^k is prime. %C A270104 a(17) > 30000. - _Giovanni Resta_, May 05 2016 %e A270104 n = 2 is a term since 3^2 + 2*2^2 = 17 is prime. %t A270104 Select[Range[1000], PrimeQ[3^# + # * 2^#]&] (* _Giovanni Resta_, May 05 2016 *) %o A270104 (MATLAB) %o A270104 if isprime(3^n + n*2^n) %o A270104 disp(n) %o A270104 end %o A270104 (PARI) is(n)=ispseudoprime(3^n+n*2^n) \\ _Charles R Greathouse IV_, Jun 13 2017 %Y A270104 Cf. A270102, A123924. %K A270104 nonn,more %O A270104 1,2 %A A270104 _Vardan Semerjyan_, Mar 11 2016 %E A270104 a(15)-a(16) from _Giovanni Resta_, May 05 2016 %E A270104 a(17) from _Michael S. Branicky_, Jul 06 2024