A061153 Numbers k such that k*2^m+1 are composites for all exponents m in the range 0<=m<=k.

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

Offset: 1

Author

Patrick De Geest, Apr 15 2001

Keywords

• nonn

Crossrefs

Cf. A061154, A061155, A061156, A061157, A061158.

Programs

Maple

filter:= n -> andmap(not isprime, [seq(n*2^m+1,m=0..n)]):
select(filter, [$1..10000]); # Robert Israel, Sep 22 2019

Extensions

More terms from Robert Israel, Sep 22 2019

Offset corrected by Sean A. Irvine, Jan 22 2023