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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.
1
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
(list; graph; refs; listen; history; text; internal format)
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

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Last modified April 12 17:34 EDT 2026. Contains 394619 sequences.
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