Primitive deficient numbers n having a companion m > n such that sigma(n)/n = sigma(m)/m (ordered by increasing (smallest possible) m).

A212611

Primitive deficient numbers n having a companion m > n such that sigma(n)/n = sigma(m)/m (ordered by increasing (smallest possible) m).

Terms

    a(0) =135a(1) =3375a(2) =25137a(3) =68607a(4) =22113a(5) =557375a(6) =451737a(7) =1278316a(8) =273a(9) =6739509a(10) =188325a(11) =8775a(12) =9020375a(13) =20365625a(14) =1083537a(15) =3416875a(16) =17875a(17) =1995a(18) =171387125a(19) =382536063a(20) =49166a(21) =366776a(22) =1487640245a(23) =417725

External references