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 A176925 #20 Jun 17 2025 11:29:32 %S A176925 43,73,2089,8233,131113,33554473,137438953513,140737488355369, %T A176925 9007199254741033,2658455991569831745807614120560689193 %N A176925 Primes of the form 2^k + 41. %C A176925 Generated by k = 1, 5, 11, 13, 17, 25, 37, 47, 53, 121, 445, 629, 839, 935, 1237, 3359, 3653, 4601,... - _R. J. Mathar_, Aug 24 2011 %C A176925 The next term has 134 digits. - _Harvey P. Dale_, Sep 24 2011 %t A176925 Select[2^Range[0,500]+41,PrimeQ] (* _Harvey P. Dale_, Sep 24 2011 *) %o A176925 (Magma) [ a: n in [0..750] | IsPrime(a) where a is 2^n+41 ]; %K A176925 nonn %O A176925 1,1 %A A176925 _Vincenzo Librandi_, Apr 29 2010