a(n) = numerator of the sum of the reciprocals of the n primes from prime(n(n-1)/2+1) to prime(n(n+1)/2).

A081980

a(n) = numerator of the sum of the reciprocals of the n primes from prime(n(n-1)/2+1) to prime(n(n+1)/2).

Terms

    a(0) =1a(1) =8a(2) =311a(3) =40808a(4) =12185065a(5) =6287341056

External references