Numbers of form j*k + k*i + i*j, where 1 <=i <= j <= k, including repetitions.

Terms

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