a(n) = numerator(Sum_{k=1..n} 1/P(k)), where P(k) = A006530(k) is the greatest prime dividing k for k >= 2, and P(1) = 1.

A378678

a(n) = numerator(Sum_{k=1..n} 1/P(k)), where P(k) = A006530(k) is the greatest prime dividing k for k >= 2, and P(1) = 1.

Terms

    a(0) =1a(1) =3a(2) =11a(3) =7a(4) =38a(5) =43a(6) =316a(7) =737a(8) =269a(9) =283a(10) =3183a(11) =10319a(12) =136457a(13) =140747a(14) =146753a(15) =80884a(16) =1390043a(17) =1475128a(18) =28282687a(19) =29252656a(20) =29945491a(21) =30386386a(22) =703736723a(23) =246972956a(24) =50881877a(25) =51453910a(26) =161798159a(27) =164985200a(28) =4806880087a(29) =24681369758

External references