Even pseudoprimes to base 41.

Terms

a(0) =4a(1) =8a(2) =10a(3) =20a(4) =40a(5) =344a(6) =4870a(7) =6892a(8) =17230a(9) =68920a(10) =250820a(11) =296440a(12) =317032a(13) =368722a(14) =369370a(15) =451426a(16) =472312a(17) =473240a(18) =632270a(19) =2326472a(20) =3186730a(21) =3429190a(22) =4438760a(23) =4670956a(24) =4948456a(25) =5509540a(26) =8990356a(27) =11817604a(28) =11841436a(29) =13094342