a(n) = 1*prime(n) + 2*prime(n-1) + ... + k*prime(n+1-k), where k=floor((n+1)/2) and prime(n) is the n-th prime.

A023870

a(n) = 1*prime(n) + 2*prime(n-1) + ... + k*prime(n+1-k), where k=floor((n+1)/2) and prime(n) is the n-th prime.

Terms

    a(0) =2a(1) =3a(2) =11a(3) =17a(4) =40a(5) =56a(6) =104a(7) =136a(8) =219a(9) =265a(10) =397a(11) =475a(12) =672a(13) =776a(14) =1046a(15) =1198a(16) =1561a(17) =1755a(18) =2223a(19) =2443a(20) =3026a(21) =3316a(22) =4030a(23) =4352a(24) =5215a(25) =5605a(26) =6631a(27) =7119a(28) =8318a(29) =8878

External references