a(n) = Sum_{1 <= x_1 <= x_2 <= x_3 <= x_4 <= x_5 <= x_6 <= n} gcd(x_1, x_2, x_3 , x_4, x_5, x_6, n).
A343520
a(n) = Sum_{1 <= x_1 <= x_2 <= x_3 <= x_4 <= x_5 <= x_6 <= n} gcd(x_1, x_2, x_3 , x_4, x_5, x_6, n).
Terms
- a(0) =1a(1) =8a(2) =30a(3) =93a(4) =214a(5) =506a(6) =930a(7) =1818a(8) =3065a(9) =5247a(10) =8018a(11) =13080a(12) =18576a(13) =28104a(14) =39300a(15) =56184a(16) =74629a(17) =104978a(18) =134614a(19) =182897a(20) =232258a(21) =304098a(22) =376762a(23) =492068a(24) =594635a(25) =754941a(26) =912384a(27) =1137106a(28) =1344932a(29) =1674374
External references
- oeis: A343520