Numbers p^2*q, p > q odd primes such that q divides p+1.

Terms

a(0) =75a(1) =363a(2) =867a(3) =1183a(4) =1587a(5) =1805a(6) =2523a(7) =4205a(8) =5043a(9) =6627a(10) =8427a(11) =10443a(12) =11767a(13) =15123a(14) =17405a(15) =20339a(16) =20667a(17) =23763a(18) =26011a(19) =30603a(20) =31205a(21) =34347a(22) =38307a(23) =39605a(24) =48223a(25) =51483a(26) =56307a(27) =59405a(28) =65863a(29) =66603