A092390 a(n) = prime(n) + prime(2n).

5, 10, 18, 26, 40, 50, 60, 72, 84, 100, 110, 126, 142, 150, 160, 184, 198, 212, 230, 244, 254, 272, 282, 312, 326, 340, 354, 370, 380, 394, 420, 442, 454, 476, 498, 510, 530, 546, 564, 582, 600, 614, 634, 650, 660, 678, 702, 726, 748, 770, 790, 808, 818, 844

Offset: 1

Author

Giovanni Teofilatto, Apr 03 2004

Keywords

• nonn
• easy

Examples

			a(1) = 5 because p(1)= 2 and p(2) = 3.
a(2) = 10 because p(2)= 3 and p(4) = 7.
a(3) = 18 because p(3)= 5 and p(6) = 13.
		

Links

• Seiichi Manyama, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A000040.

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

Programs

Mathematica

Table[Prime[n]+Prime[2n],{n,60}] (* Harvey P. Dale, Jan 03 2012 *)

Extensions

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

Offset 1 from Seiichi Manyama, Jan 17 2020