|
%I #12 Dec 30 2016 02:32:14
%S 2,13,19,41,47,67,79,97,109,137,157,193,251,271,283,307,313,331,367,
%T 379,397,443,457,463,499,521,541,569,587,617,641,661,677,733,743,769,
%U 787,809,829,859,877,883,929,971,1009,1021,1039,1051,1087,1109,1129,1171,1213,1231,1259,1279,1291
%N Primes with odd number of 1's in binary expansion such that next prime has even number of 1's.
%H Robert Israel, <a href="/A027705/b027705.txt">Table of n, a(n) for n = 1..10000</a>
%p N:=1000: # to get all terms in the first N primes
%p Res:= NULL: w:= 0: p:= 0:
%p for i from 1 to N+1 do
%p q:= nextprime(p);
%p v:= convert(convert(q,base,2),`+`) mod 2;
%p if w = 1 and v = 0 then Res:= Res, p fi;
%p p:= q; w:= v;
%p od:
%p Res; # _Robert Israel_, Dec 29 2016
%K nonn
%O 1,1
%A _N. J. A. Sloane_
%E More terms from Scott Lindhurst (ScottL(AT)alumni.princeton.edu)
%E Offset changed by _Robert Israel_, Dec 29 2016
|
