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Search: id:A160216
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| A160216 |
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Primes congruent to 2^k+1 (mod 2^(k+1)), where k is any odd integer >=1. |
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+0
4
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| 3, 7, 11, 19, 23, 31, 41, 43, 47, 59, 67, 71, 73, 79, 83, 89, 97, 103, 107, 127, 131, 137, 139, 151, 163, 167, 179, 191, 199, 211, 223, 227, 233, 239, 251, 263, 271, 281, 283, 307, 311, 313, 331, 347, 353, 359, 367, 379, 383, 409, 419, 431, 439, 443, 457, 463
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OFFSET
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1,1
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COMMENT
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The Lim (x -> inf.) the number of terms < x in A160216/A160215 => 2. [From Robert G. Wilson v (rgwv(AT)rgwv.com), May 31 2009]
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FORMULA
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A000040 \ A160215.
{prime(k) : A023506(k) is odd} - [R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Mary 08 2009]
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MATHEMATICA
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fQ[n_] := Mod[ Flatten[ FactorInteger[n - 1]] [[2]], 2] == 1; Select[ Prime@ Range@ 90, fQ@# &] [From Robert G. Wilson v (rgwv(AT)rgwv.com), May 31 2009]
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CROSSREFS
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A000040, A160215
Sequence in context: A085760 A131426 A080978 this_sequence A002145 A092109 A117991
Adjacent sequences: A160213 A160214 A160215 this_sequence A160217 A160218 A160219
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KEYWORD
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nonn
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AUTHOR
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Vladimir Shevelev (shevelev(AT)bgu.ac.il), May 04 2009
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EXTENSIONS
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Edited by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 08 2009
More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), May 31 2009
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