Numbers m where m^2 divides A159553(m), where A159553(m) = Sum_{k=0..m} binomial(m,k) * gcd(m,k).

A159555

Numbers m where m^2 divides A159553(m), where A159553(m) = Sum_{k=0..m} binomial(m,k) * gcd(m,k).

Terms

    a(0) =1a(1) =6a(2) =22a(3) =72a(4) =114a(5) =148a(6) =164a(7) =260a(8) =261a(9) =780a(10) =1078a(11) =1184a(12) =1266a(13) =2952a(14) =4674a(15) =21868

External references