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

Terms

a(0) =15a(1) =63a(2) =147a(3) =171a(4) =207a(5) =627a(6) =663a(7) =1023a(8) =1647a(9) =1971a(10) =2975a(11) =6399a(12) =18063a(13) =19359a(14) =27639a(15) =40215a(16) =48895a(17) =58563a(18) =78819a(19) =95511a(20) =114231a(21) =133595a(22) =134871a(23) =145915a(24) =147455a(25) =163539a(26) =168507a(27) =172287a(28) =188067a(29) =529983