A241686 - OEIS

%I #16 May 10 2014 10:00:39

%S 1,2,3,3,3,5,3,5,7,7,5,11,7,11,13,13,11,17,7,17,19,13,17,19,19,23,23,

%T 19,17,29,19,23,29,31,29,31,31,29,37,37,29,41,19,41,43,31,41,43,37,47,

%U 43,43,47,47,43,53,53,43,47,59,43,53,59,61,59,61,61,53

%N a(1)=1, a(2)=2, a(3)=3; for n>=4, a(n) = n - A082467(n).

%C a(i)=i, i=1,2,3, since A082467 is natural extended as 0 for n=1,2,3. For n>=2, a(n) and 2*n-a(n) are both primes. Sequence {2*n - a(n)} begins 1,2,3,5,7,7,11,11,11,13,17,13,19,17,17,19,23,19,31,...

%H Peter J. C. Moses, <a href="/A241686/b241686.txt">Table of n, a(n) for n = 1..1000</a>

%Y Cf. A082467.

%K nonn

%O 1,2

%A _Vladimir Shevelev_, Apr 27 2014

%E More terms from _Peter J. C. Moses_