Triangle of numbers T(n,k), where T(n,k) is the number of sets S = {a_1, a_2, ..., a_k}, with 1 < a_i < a_j <= n such that no a_j divides the product of all the others.
A023996
Triangle of numbers T(n,k), where T(n,k) is the number of sets S = {a_1, a_2, ..., a_k}, with 1 < a_i < a_j <= n such that no a_j divides the product of all the others.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =1a(6) =1a(7) =3a(8) =2a(9) =1a(10) =4a(11) =5a(12) =2a(13) =1a(14) =5a(15) =7a(16) =3a(17) =1a(18) =6a(19) =12a(20) =10a(21) =3a(22) =1a(23) =7a(24) =16a(25) =15a(26) =5a(27) =1a(28) =8a(29) =22
External references
- oeis: A023996