a(n) is the numerator of the sum of the reciprocals of the positive integers k, k<=n, where every positive integer <= k and coprime to k is also coprime to n.
A126261
a(n) is the numerator of the sum of the reciprocals of the positive integers k, k<=n, where every positive integer <= k and coprime to k is also coprime to n.
Terms
- a(0) =1a(1) =3a(2) =11a(3) =7a(4) =137a(5) =5a(6) =363a(7) =49a(8) =19a(9) =37a(10) =83711a(11) =7a(12) =1145993a(13) =167a(14) =19a(15) =1321a(16) =42142223a(17) =65a(18) =275295799a(19) =19a(20) =43a(21) =2887a(22) =444316699a(23) =133a(24) =127a(25) =1177a(26) =18469a(27) =85a(29) =23a(31) =3877999
External references
- oeis: A126261