C, 109 bytes main(int a,char**b){for(long i=0,x;++i<1L<<atol(b[1]);){x=i>>(ffs(i)-1);if(x>>(ffs(~x)-1))printf("%ld,",i);}} Ungolfed: main(int a,char**b) { for(long i = 0; ++i < 1 << atol(b[1]);) { x = i >> (ffsl(i) - 1); if (x >> (ffsl(~x) - 1)) printf("%ld,",i); } } The fun...
user55340
user55340
user55340
user55340
user55340
user55340
user55340
user55340
user55340
user114359
user55340
user114359
user55340
user55340
user55340
user55340
user114359
user114359
user55340
user55340
user114359
user55340
user55340
user55340
user114359
user114359
user55340
user114359
user55340
user55340
user114359
user55340
user114359
user55340
user55340
user55340
user55340
user114359
user55340
user55340
user55340
user55340
user55340
user55340
user55340
user114359
user55340
user55340
user114359
user114359
user114359
user114359
user114359
user55340
user55340
user55340
user55340
user114359
user114359
user55340
user114359
user114359
user114359
user55340
user114359
user55340
user114359
user55340
user114359
user114359
user114359
user55340
user114359
user55340
user114359
user55340
user114359
user55340
user55340
user114359
user55340
user55340
user114359
user55340
user41796
user41796
user41796
user41796
user41796
user55340
user55340
user55340
user41796
user41796
user55340
user55340
user41796
user41796
user41796
user41796
user41796
user41796
user41796
user41796
user41796
user41796
user41796
user41796
user41796
user55340
user55340
user41796
user41796
user55340
user55340
user55340
user55340
user41796
user55340
user41796
user41796
user55340
user41796
user55340
user41796
user41796
user41796
user41796
user41796
user41796
user41796
user41796
user41796
user41796
user41796
user41796
user41796
user41796
user41796
user41796
user41796
user41796
user41796
user55340
user55340
user55340
user41796
user41796
user41796
user41796
user41796
user41796
user41796
user41796
user55340
user41796
user41796
user41796
user41796
user41796
user41796
user41796
user41796
user114359
user55340
user114359
user55340
user55340
user55340
user55340
user55340
user55340
user55340
user55340
user41796