A174801 - OEIS

%I #3 Mar 30 2012 18:52:39

%S 1,2,3,6,12,18,21,37,44,59,65,78,82,88,100,112,121,122,130,134,151,

%T 168,183,191,197,198,203,216,221,231,257,260,273,287,295,301,306,322,

%U 347,366,375,378,407,415,422,438,455,459,466,491,521,556,560,574,585,587

%N Prime(n)+1 is prime or semiprime.

%e a(1)=1 because prime(1)+1=3=prime; a(2)=2 because prime(2)+1=4=semiprime; a(3)=3 because prime(3)+1=6=semiprime; a(4)=6 because prime(6)+1=14=semiprime.

%Y Cf. A000040, A001358.

%K nonn

%O 1,2

%A _Juri-Stepan Gerasimov_, Mar 29 2010

%E Extended by _Ray Chandler_, Apr 06 2010