A168272 - OEIS

%I #7 Jul 12 2012 00:39:51

%S 1,2,2,2,8,12,22,24,36,56,66,86,106,112,122,144,176,180,224,240,236,

%T 264,292,312,358,384,396,414,418,424,512,540,550,570,630,644,680,716,

%U 734,768,794,816,872,878,894,906,984,1092,1096,1100,1122,1140,1150,1218

%N Abs(prime(prime(n))-prime(nonprime(n))).

%F a(n)=abs(A006450(n)-A007821(n)).

%e a(1)=abs(3-2)=1, a(2)=abs(5-7)=2, a(3)=abs(11-13)=2, a(4)=abs(17-19)=2, a(5)=abs(31-23)=8.

%Y Cf. A000040(n-th prime), A006450((n-th prime)th prime), A007821((n-th nonprime)th prime), A018252(n-th nonprime).

%K nonn,easy,less

%O 1,2

%A _Juri-Stepan Gerasimov_, Nov 22 2009

%E Corrected (26 replaced by 36, 1218 inserted) by _R. J. Mathar_, Jun 04 2010