a(n) = Product_{d|n, d<n} A019565(A289813(d)); a product obtained from the 1-digits present in ternary expansions of proper divisors of n.

A293221

a(n) = Product_{d|n, d<n} A019565(A289813(d)); a product obtained from the 1-digits present in ternary expansions of proper divisors of n.

Terms

    a(0) =1a(1) =2a(2) =2a(3) =2a(4) =2a(5) =6a(6) =2a(7) =12a(8) =6a(9) =6a(10) =2a(11) =36a(12) =2a(13) =4a(14) =18a(15) =12a(16) =2a(17) =30a(18) =2a(19) =360a(20) =12a(21) =10a(22) =2a(23) =540a(24) =6a(25) =60a(26) =30a(27) =360a(28) =2a(29) =900

External references