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 A236752 #28 Oct 16 2019 05:50:13 %S A236752 3,11,31,79,191,5119,245759,524287,1114111,3758096383, %T A236752 1618481116086271,653980173926178609468673073657929531391, %U A236752 5359447279004780799548150067050349330431 %N A236752 Primes of the form k*2^(k-1) - 1. %C A236752 Primes in A087323. %C A236752 Corresponding values of k: 2, 3, 4, 5, 6, 10, 15, 16, 17, 28, 46, 123, ... %C A236752 The values of k-1 are listed in A230769. - _Jeppe Stig Nielsen_, Oct 16 2019 %e A236752 79 is in this sequence because it is prime and for k = 5, k*2^(k-1) - 1 = 5*2^(5-1) - 1 = 79. %Y A236752 Cf. A002054, A003261, A196273, A230769. %K A236752 nonn %O A236752 1,1 %A A236752 _Gerasimov Sergey_, Jan 30 2014 %E A236752 More terms and corrections of terms and comments by _Ralf Stephan_, Feb 03 2014