Triangle read by rows: T(m,n) = number of solutions to 1 <= a(1) < a(2) < ... < a(m) <= n, where gcd( a(1), a(2), ..., a(m), n) = 1.
A020921
Triangle read by rows: T(m,n) = number of solutions to 1 <= a(1) < a(2) < ... < a(m) <= n, where gcd( a(1), a(2), ..., a(m), n) = 1.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =0a(4) =1a(5) =1a(6) =0a(7) =2a(8) =3a(9) =1a(10) =0a(11) =2a(12) =5a(13) =4a(14) =1a(15) =0a(16) =4a(17) =10a(18) =10a(19) =5a(20) =1a(21) =0a(22) =2a(23) =11a(24) =19a(25) =15a(26) =6a(27) =1a(28) =0a(29) =6
External references
- oeis: A020921