The OEIS Foundation is grateful to everyone who made a donation during our Annual Appeal. Visit the new and spectacular Pictures from the OEIS page!
1,1
Lim_{x -> inf.} the number of terms < x in A160216/A160215 => 2. - Robert G. Wilson v, May 31 2009
Table of n, a(n) for n=1..56.
A000040 \ A160215.
{prime(k) : A023506(k) is odd}. - R. J. Mathar, May 08 2009
fQ[n_] := Mod[ Flatten[ FactorInteger[n - 1]] [[2]], 2] == 1; Select[ Prime@ Range@ 90, fQ@# &] (* Robert G. Wilson v, May 31 2009 *)
Cf. A000040, A160215.
Sequence in context: A179481 A131426 A080978 * A181516 A002145 A002052
Adjacent sequences: A160213 A160214 A160215 * A160217 A160218 A160219
nonn
Vladimir Shevelev, May 04 2009
Edited by R. J. Mathar, May 08 2009
More terms from Robert G. Wilson v, May 31 2009
approved