usigma(n) = sum of unitary divisors of n (divisors d such that gcd(d, n/d)=1); also called UnitarySigma(n).

A034448

usigma(n) = sum of unitary divisors of n (divisors d such that gcd(d, n/d)=1); also called UnitarySigma(n).

Terms

    a(0) =1a(1) =3a(2) =4a(3) =5a(4) =6a(5) =12a(6) =8a(7) =9a(8) =10a(9) =18a(10) =12a(11) =20a(12) =14a(13) =24a(14) =24a(15) =17a(16) =18a(17) =30a(18) =20a(19) =30a(20) =32a(21) =36a(22) =24a(23) =36a(24) =26a(25) =42a(26) =28a(27) =40a(28) =30a(29) =72

External references