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A160216 Primes congruent to 2^k+1 (mod 2^(k+1)), where k is any odd integer >=1. 4
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Lim_{x -> inf.} the number of terms < x in A160216/A160215 => 2. - Robert G. Wilson v, May 31 2009

LINKS

Table of n, a(n) for n=1..56.

FORMULA

A000040 \ A160215.

{prime(k) : A023506(k) is odd}. - R. J. Mathar, May 08 2009

MATHEMATICA

fQ[n_] := Mod[ Flatten[ FactorInteger[n - 1]] [[2]], 2] == 1; Select[ Prime@ Range@ 90, fQ@# &] (* Robert G. Wilson v, May 31 2009 *)

CROSSREFS

Cf. A000040, A160215.

Sequence in context: A179481 A131426 A080978 * A181516 A002145 A002052

Adjacent sequences:  A160213 A160214 A160215 * A160217 A160218 A160219

KEYWORD

nonn

AUTHOR

Vladimir Shevelev, May 04 2009

EXTENSIONS

Edited by R. J. Mathar, May 08 2009

More terms from Robert G. Wilson v, May 31 2009

STATUS

approved

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Last modified September 5 00:37 EDT 2015. Contains 261339 sequences.