a(n) is the denominator 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.
A126262
a(n) is the denominator 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) =2a(2) =6a(3) =4a(4) =60a(5) =3a(6) =140a(7) =24a(8) =9a(9) =20a(10) =27720a(11) =4a(12) =360360a(13) =84a(14) =10a(15) =560a(16) =12252240a(17) =36a(18) =77597520a(19) =10a(20) =21a(21) =1320a(22) =118982864a(23) =72a(24) =50a(25) =520a(26) =7560a(27) =42a(29) =15a(31) =1441440
External references
- oeis: A126262