a(n)=phi(n^2+1)/n if (n^2+1) is composite and phi(n^2+1)==0 (mod n).

Terms

a(0) =6a(1) =25a(2) =48a(3) =60a(4) =98a(5) =150a(6) =192a(7) =304a(8) =336a(9) =896a(10) =990a(11) =800a(12) =1248a(13) =1232a(14) =1210a(15) =1105a(16) =1798a(17) =2448a(18) =2790a(19) =4032a(20) =5166a(21) =5095a(22) =7488a(23) =8925a(24) =9798a(25) =8484a(26) =12540a(27) =12528a(28) =14448a(29) =14112