A251757 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.

39939, 656709, 762701, 777149, 779619, 790841, 869859, 1106681, 1156299, 1254341, 1320981, 1330319, 1730681, 2251349, 2344211, 2882541, 2924861, 3079469, 3292241, 3419789, 3580901, 3661529, 3781541, 3784439, 3848289, 4358481, 4384979, 4507889, 4524549

Offset

1,1

Comments

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

Links

Table of n, a(n) for n=1..29.

Crossrefs

Cf. A101036, A251057.

Sequence in context: A254985 A210386 A076670 * A250334 A250909 A252332

Adjacent sequences: A251754 A251755 A251756 * A251758 A251759 A251760

Keyword

nonn

Author

Arkadiusz Wesolowski, Dec 15 2014

Status

approved