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a(n) = prime(n) + prime(2n).
2

%I #12 Jan 17 2020 10:36:09

%S 5,10,18,26,40,50,60,72,84,100,110,126,142,150,160,184,198,212,230,

%T 244,254,272,282,312,326,340,354,370,380,394,420,442,454,476,498,510,

%U 530,546,564,582,600,614,634,650,660,678,702,726,748,770,790,808,818,844

%N a(n) = prime(n) + prime(2n).

%H Seiichi Manyama, <a href="/A092390/b092390.txt">Table of n, a(n) for n = 1..10000</a>

%e a(1) = 5 because p(1)= 2 and p(2) = 3.

%e a(2) = 10 because p(2)= 3 and p(4) = 7.

%e a(3) = 18 because p(3)= 5 and p(6) = 13.

%t Table[Prime[n]+Prime[2n],{n,60}] (* _Harvey P. Dale_, Jan 03 2012 *)

%Y Cf. A000040.

%Y Equals 2*A087461(n) for n>1.

%K nonn,easy

%O 1,1

%A _Giovanni Teofilatto_, Apr 03 2004

%E More terms from Pab Ter (pabrlos(AT)yahoo.com), May 25 2004

%E Offset 1 from _Seiichi Manyama_, Jan 17 2020