Numbers n such that there are precisely 15 groups of orders n and n + 1.

Terms

a(0) =1863a(1) =1971a(2) =4292a(3) =7624a(4) =8180a(5) =15140a(6) =17875a(7) =19524a(8) =20180a(9) =21020a(10) =23732a(11) =23751a(12) =28371a(13) =30124a(14) =33032a(15) =33939a(16) =34532a(17) =35427a(18) =36620a(19) =40071a(20) =41444a(21) =42579a(22) =44739a(23) =45128a(24) =45603a(25) =46052