Number x such that sigma(x) = usigma(x) + (-1)sigma(x), where sigma(x) is the sum of divisors of x (A000203), usigma(x) is the sum of unitary divisors of x (A034448) and (-1)sigma(x) is defined in A049060.

A258106

Number x such that sigma(x) = usigma(x) + (-1)sigma(x), where sigma(x) is the sum of divisors of x (A000203), usigma(x) is the sum of unitary divisors of x (A034448) and (-1)sigma(x) is defined in A049060.

Terms

    a(0) =1998a(1) =3876a(2) =4524a(3) =10062a(4) =21582a(5) =45220a(6) =52780a(7) =85428a(8) =125976a(9) =226100a(10) =263900a(11) =271092a(12) =511428a(13) =597012a(14) =602946a(15) =839106a(16) =1033974a(17) =1130500a(18) =1274724a(19) =1280532a(20) =1319500a(21) =1435764a(22) =1469720a(23) =1575860a(24) =1810926a(25) =1895706a(26) =2171364a(27) =2550636a(28) =3162740a(29) =4083366

External references