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A061153 Numbers k such that k*2^m+1 are composites for all exponents m in the range 0<=m<=k. 5
47, 94, 188, 257, 376, 383, 766, 881, 1532, 2897, 3061, 3064, 4847, 5297, 5359, 5794, 5897, 6122, 6128, 7013, 7651, 8423, 9694, 10223, 10594, 10718, 11794, 12244, 13787, 14026, 14027, 15302, 16817, 16846, 18107, 19249, 19388, 20446, 21181, 21188 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
MAPLE
filter:= n -> andmap(not isprime, [seq(n*2^m+1, m=0..n)]):
select(filter, [$1..10000]); # Robert Israel, Sep 22 2019
CROSSREFS
Sequence in context: A217355 A004943 A004963 * A335076 A044185 A044566
KEYWORD
nonn
AUTHOR
Patrick De Geest, Apr 15 2001
EXTENSIONS
More terms from Robert Israel, Sep 22 2019
Offset corrected by Sean A. Irvine, Jan 22 2023
STATUS
approved

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Last modified April 16 07:08 EDT 2024. Contains 371698 sequences. (Running on oeis4.)