A251757 - OEIS

%I #23 Dec 28 2014 23:45:35

%S 39939,656709,762701,777149,779619,790841,869859,1106681,1156299,

%T 1254341,1320981,1330319,1730681,2251349,2344211,2882541,2924861,

%U 3079469,3292241,3419789,3580901,3661529,3781541,3784439,3848289,4358481,4384979,4507889,4524549

%N Odd numbers n not congruent to 1 mod 6 and that are not perfect powers such that for all k >= 1 the numbers n*4^k - 1 are composite.

%C a(n) is a Riesel number if it is of the form 6*m + 5.

%Y Cf. A101036, A251057.

%K nonn

%O 1,1

%A _Arkadiusz Wesolowski_, Dec 15 2014