Fermat pseudoprimes to base 2 of the form (n^2 + 2*n)/3.

Terms

a(0) =341a(1) =645a(2) =2465a(3) =2821a(4) =4033a(5) =5461a(6) =8321a(7) =15841a(8) =25761a(9) =31621a(10) =68101a(11) =83333a(12) =162401a(13) =219781a(14) =282133a(15) =348161a(16) =530881a(17) =587861a(18) =653333a(19) =710533a(20) =722261a(21) =997633a(22) =1053761a(23) =1082401a(24) =1193221a(25) =1246785a(26) =1333333a(27) =1357441a(28) =1398101a(29) =1489665