sp(n)*pi(n) = A034387(n)*A000720(n) = (sum of primes <= n)*(number of primes <= n).

Terms

a(0) =0a(1) =0a(2) =2a(3) =10a(4) =10a(5) =30a(6) =30a(7) =68a(8) =68a(9) =68a(10) =68a(11) =140a(12) =140a(13) =246a(14) =246a(15) =246a(16) =246a(17) =406a(18) =406a(19) =616a(20) =616a(21) =616a(22) =616a(23) =900a(24) =900a(25) =900a(26) =900a(27) =900a(28) =900a(29) =1290