Numbers m such that there are precisely 13 groups of order m.

Terms

a(0) =56a(1) =60a(2) =150a(3) =189a(4) =441a(5) =726a(6) =837a(7) =945a(8) =1012a(9) =1161a(10) =1204a(11) =1521a(12) =1575a(13) =1647a(14) =1734a(15) =1809a(16) =1988a(17) =2079a(18) =2133a(19) =2205a(20) =2366a(21) =2619a(22) =2781a(23) =2925a(24) =2948a(25) =3174a(26) =3213a(27) =3556a(28) =3610a(29) =3753