A086169 Sum of the first n twin prime pairs.
8, 20, 44, 80, 140, 224, 344, 488, 692, 908, 1184, 1484, 1844, 2228, 2624, 3080, 3560, 4100, 4664, 5288, 5984, 6824, 7688, 8612, 9656, 10796, 11996, 13232, 14516, 15836, 17456, 19100, 20756, 22472, 24236, 26276, 28340, 30440, 32564, 34748, 37052
Offset: 1
Keywords
Examples
For n = 4 we have twin prime pairs (3,5) (5,7) (11,13) (17,19) and 3+5+5+7+11+13+17+19 = 80
Links
- Harvey P. Dale, Table of n, a(n) for n = 1..1000
Programs
-
Mathematica
Accumulate[Total/@Select[Partition[Prime[Range[300]],2,1],#[[2]]-#[[1]] == 2&]] (* Harvey P. Dale, Nov 09 2019 *)
-
PARI
addnexttwin(n)= { s=0; for(x=1,n, if(prime(x+1)-prime(x)==2,s=s+prime(x+1)+prime(x); print1(s",")) ) }