a(n) = Sum_{x_1|n, x_2|n, x_3|n, x_4|n, x_5|n} gcd(x_1,x_2,x_3,x_4,x_5).

Terms

a(0) =1a(1) =33a(2) =34a(3) =277a(4) =36a(5) =1122a(6) =38a(7) =1335a(8) =313a(9) =1188a(10) =42a(11) =9418a(12) =44a(13) =1254a(14) =1224a(15) =4771a(16) =48a(17) =10329a(18) =50a(19) =9972a(20) =1292a(21) =1386a(22) =54a(23) =45390a(24) =391a(25) =1452a(26) =1720a(27) =10526a(28) =60a(29) =40392