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 A265503 #24 Sep 08 2022 08:46:14 %S A265503 1,13,553,861,1983,2065,2403,4371,6226,6553,6580,10128,10998,11193, %T A265503 12411,12598,12909,13056,13194,13399,14589,15829,18429,18436,19315, %U A265503 19900,21574,23599,24006,24024,24415,25704,27225,27651,28689,29461,29805,29868,31143,31186,32674,33706,34306,35016,36118 %N A265503 Numbers n such that n*2^2203 - 1 is prime. %C A265503 The exponent of 2 in the expression, 2203, is a Mersenne exponent. %e A265503 n = 1 is a term since 2^2203 - 1 is prime (the 16th Mersenne prime). %t A265503 Select[Range@ 36200, PrimeQ[# 2^2203 - 1] &] (* _Michael De Vlieger_, Dec 09 2015 *) %o A265503 (MATLAB) %o A265503 if isprime(n*2^2203-1) %o A265503 disp(n) %o A265503 end %o A265503 (PARI) is(n)=ispseudoprime(n*2^2203-1) \\ _Anders Hellström_, Dec 09 2015 %o A265503 (Magma) [n: n in [1..7*10^3] |IsPrime(n*2^2203-1)]; // _Vincenzo Librandi_, Dec 10 2015 %Y A265503 Cf. A000043, A001348, A005122. %K A265503 nonn %O A265503 1,2 %A A265503 _Vardan Semerjyan_, Dec 09 2015 %E A265503 More terms from _Michael De Vlieger_, Dec 09 2015