a(n) is the numerator of the sum of the reciprocals of the first n squarefree numbers.

A354417

a(n) is the numerator of the sum of the reciprocals of the first n squarefree numbers.

Terms

    a(0) =1a(1) =3a(2) =11a(3) =61a(4) =11a(5) =82a(6) =171a(7) =1951a(8) =26133a(9) =13424a(10) =41273a(11) =716656a(12) =13871719a(13) =4700888a(14) =9548741a(15) =222854273a(16) =112857219a(17) =3310041496a(18) =20075905417a(19) =628822761157a(20) =19239404599a(21) =9709078632a(22) =1959180271a(23) =73097429088a(24) =147378388979a(25) =445594718515

External references