Numerator of sum(1/(phi(k)sigma(k)),k=1..n), where phi(k) is the totient function and sigma(k) is the sum of the divisors function.

A104526

Numerator of sum(1/(phi(k)sigma(k)),k=1..n), where phi(k) is the totient function and sigma(k) is the sum of the divisors function.

Terms

    a(0) =1a(1) =4a(2) =35a(3) =257a(4) =11a(5) =271a(6) =183a(7) =2773a(8) =36329a(9) =109897a(10) =110443a(11) =27757a(12) =55709a(13) =37291a(14) =49873a(15) =1549703a(16) =13975537a(17) =14010257a(18) =2806565a(19) =2811401a(20) =5631265a(21) =9400487a(22) =103518197a(23) =103642321a(24) =103738417a(25) =311569891a(26) =311818139a(27) =312084119a(28) =312296903a(29) =312607213

External references