This site is supported by donations to The OEIS Foundation.

Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 5000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A077126 Sum of even indexed primes. 4

%I

%S 3,10,23,42,71,108,151,204,265,336,415,504,605,712,825,956,1095,1246,

%T 1409,1582,1763,1956,2155,2378,2607,2846,3097,3360,3631,3912,4205,

%U 4516,4833,5170,5519,5878,6251,6634,7031,7440,7861,8294,8737,9194,9657

%N Sum of even indexed primes.

%C Partial sums of A031215. - _Michel Marcus_, Oct 27 2015

%e p_1=2, p_2=3, p_3=5 and p_4=7, therefore a(2) = p_2 + p_4 = 3 + 7 = 10.

%o (PARI) pc=1; ps=0; forprime (p=2,500,pc=3-pc; if (pc==1,ps=ps+p; print1(ps",")))

%Y Cf. A031215, A077131.

%K nonn

%O 1,1

%A _Jon Perry_, Nov 29 2002

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.