Hemi-imperfect numbers: numbers such that the denominator of k/A206369(k) is equal to 2.

A295236

Hemi-imperfect numbers: numbers such that the denominator of k/A206369(k) is equal to 2.

Terms

    a(0) =3a(1) =10a(2) =42a(3) =60a(4) =63a(5) =840a(6) =1260a(7) =12642a(8) =18480a(9) =18900a(10) =18963a(11) =154350a(12) =228480a(13) =252840a(14) =379260a(15) =3458700a(16) =5562480a(17) =5688900a(18) =68772480a(19) =1041068700a(20) =15032156160a(21) =53621568000

External references