Numbers that begin a run of consecutive integers k such that the denominator of the k-th harmonic number is lcm(1..k).

A330680

Numbers that begin a run of consecutive integers k such that the denominator of the k-th harmonic number is lcm(1..k).

Terms

    a(0) =1a(1) =9a(2) =27a(3) =49a(4) =88a(5) =125a(6) =243a(7) =289a(8) =361a(9) =484a(10) =841a(11) =968a(12) =1164a(13) =1331a(14) =1369a(15) =2401a(16) =3125a(17) =3488a(18) =3721a(19) =6889a(20) =7085a(21) =7761a(22) =7921a(23) =8342a(24) =8502a(25) =9156a(26) =10648a(27) =19683a(28) =22208a(29) =22801

External references