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 A036379 #10 Apr 23 2017 01:13:07 %S A036379 15,15,45,63,85,123,153,255,323,511,603,1023,1139,2047,2227,4095,4369, %T A036379 8189,8777,16383,17219,32767,33667,65535,67591,131069,133897,262143, %U A036379 264967,524285,527621,1048575,1053443 %N A036379 Special connected numbers: minimal and maximal connected numbers (cf. A029827) of a given binary order, i.e., between two consecutive powers of 2. %C A036379 Observe in the sequence that although the values of 2^g-1 are often maximal marginal connected numbers, this is not an absolute rule. %e A036379 Between 1024 and 2048 (i.e., in the range with binary order 11) 1139 and 2047 are the smallest and largest composite connected numbers. %Y A036379 Cf. A029827. %K A036379 nonn %O A036379 1,1 %A A036379 _Labos Elemer_