Numbers n such that there are precisely 2 groups of order n and 3 of order n + 1.

Terms

a(0) =74a(1) =362a(2) =866a(3) =2066a(4) =2174a(5) =3974a(6) =4894a(7) =5042a(8) =5914a(9) =6626a(10) =7934a(11) =10334a(12) =10886a(13) =12634a(14) =15122a(15) =16538a(16) =17474a(17) =19238a(18) =20318a(19) =20338a(20) =20666a(21) =21974a(22) =23774a(23) =23882a(24) =24422a(25) =25094a(26) =28922a(27) =31478a(28) =33134a(29) =35138