Partial sums of hexagonal numbers with prime indices.

Terms

a(0) =6a(1) =21a(2) =66a(3) =157a(4) =388a(5) =713a(6) =1274a(7) =1977a(8) =3012a(9) =4665a(10) =6556a(11) =9257a(12) =12578a(13) =16233a(14) =20604a(15) =26169a(16) =33072a(17) =40453a(18) =49364a(19) =59375a(20) =69960a(21) =82363a(22) =96058a(23) =111811a(24) =130532a(25) =150833a(26) =171948a(27) =194739a(28) =218392a(29) =243817