Numbers n such that there are precisely 2 groups of orders n, n + 1 and n + 2.

Terms

a(0) =201a(1) =205a(2) =325a(3) =1045a(4) =1653a(5) =1857a(6) =1965a(7) =2041a(8) =2301a(9) =2305a(10) =2605a(11) =2637a(12) =2653a(13) =2853a(14) =2973a(15) =3241a(16) =3445a(17) =3505a(18) =3721a(19) =3757a(20) =4173a(21) =4405a(22) =4585a(23) =4693a(24) =5005a(25) =5217a(26) =5241a(27) =5341a(28) =5685a(29) =5757