Numbers m such that there are precisely 20 groups of order m.

Terms

a(0) =820a(1) =1220a(2) =1530a(3) =2020a(4) =2070a(5) =2610a(6) =2756a(7) =3366a(8) =3620a(9) =4230a(10) =4550a(11) =4770a(12) =4820a(13) =5310a(14) =5620a(15) =5742a(16) =5950a(17) =6370a(18) =6650a(19) =7038a(20) =7470a(21) =8010a(22) =8020a(23) =8050a(24) =8118a(25) =8164a(26) =8330a(27) =8420a(28) =8874a(29) =9220