Deficient 2-hyperperfect numbers: numbers k such that 3*k/2 + 1/2 - sigma(k) is a proper divisor of k.

A305617

Deficient 2-hyperperfect numbers: numbers k such that 3*k/2 + 1/2 - sigma(k) is a proper divisor of k.

Terms

    a(0) =3a(1) =9a(2) =27a(3) =35a(4) =39a(5) =55a(6) =81a(7) =243a(8) =279a(9) =387a(10) =715a(11) =729a(12) =1443a(13) =2187a(14) =2619a(15) =3655a(16) =5635a(17) =6561a(18) =10855a(19) =12635a(20) =19683a(21) =59049a(22) =77283a(23) =177147a(24) =178119a(25) =294759a(26) =443135a(27) =531441a(28) =817167a(29) =1170723

External references