Numbers k such that j(k) + ud(k) = d(k), where j(k) = A033831, ud(k) = number of unitary divisors of k (A034444), d(k) = number of divisors of k (A000005).

A033858

Numbers k such that j(k) + ud(k) = d(k), where j(k) = A033831, ud(k) = number of unitary divisors of k (A034444), d(k) = number of divisors of k (A000005).

Terms

    a(0) =1a(1) =2a(2) =4a(3) =8a(4) =9a(5) =12a(6) =20a(7) =24a(8) =25a(9) =27a(10) =40a(11) =49a(12) =54a(13) =88a(14) =104a(15) =120a(16) =121a(17) =125a(18) =135a(19) =136a(20) =152a(21) =168a(22) =169a(23) =184a(24) =189a(25) =232a(26) =248a(27) =250a(28) =264a(29) =270

External references