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 A192542 #15 Jun 13 2017 14:52:53 %S A192542 15,25,27,28,30,34,38,40,43,45,47,48,49,51,53,55,60,71,72,75,88,97,99, %T A192542 106,113,117,126,128,132,139,145,146,148,151,154,168,169,175,176,177, %U A192542 185,186,192,208,216,223,227,232,240,253,259 %N A192542 Numbers n such that the interval [2^n-n, 2^n] is prime-free. %C A192542 Places n where A192064(n)=0. %C A192542 The numbers not in the sequence are characterized in A000043, A050414, A059608, A059610, etc. %t A192542 Select[Range[260],NextPrime[2^#-#]>2^#&] (* _Harvey P. Dale_, Apr 08 2013 *) %o A192542 (PARI) is(n)=nextprime(2^n-n)>2^n \\ _Charles R Greathouse IV_, Jun 13 2017 %Y A192542 Cf. A192064. %K A192542 nonn %O A192542 1,1 %A A192542 _Juri-Stepan Gerasimov_, Jul 03 2011 %E A192542 Corrected (a(16)=55 inserted) by _Harvey P. Dale_, Apr 08 2013