Harmonic numbers m from A001599 such that m*(m-tau(m))/sigma(m) is not an integer, where k-tau(k) = the number of nondivisors of k (A049820), tau(k) = the number of divisors of k (A000005) and sigma(k) = the sum of the divisors of k (A000203).

A325022

Harmonic numbers m from A001599 such that m*(m-tau(m))/sigma(m) is not an integer, where k-tau(k) = the number of nondivisors of k (A049820), tau(k) = the number of divisors of k (A000005) and sigma(k) = the sum of the divisors of k (A000203).

Terms

    a(0) =140a(1) =270a(2) =1638a(3) =2970a(4) =6200a(5) =8190a(6) =18600a(7) =18620a(8) =27846a(9) =55860a(10) =105664a(11) =117800a(12) =167400a(13) =173600a(14) =237510a(15) =242060a(16) =360360a(17) =539400a(18) =726180a(19) =753480a(20) =950976a(21) =1089270a(22) =1421280a(23) =1539720a(24) =2229500a(25) =2290260a(26) =2457000a(27) =2845800a(28) =4358600a(29) =4713984

External references